The Auction After the Click: Privacy, Antitrust, and AI

On February 3, 2022, Meta lost roughly $232 billion in market value in a single trading day. The stock fell 26%. It was, at the time, the largest one-day destruction of corporate value in American history.

The cause was a software prompt. Ten months earlier, Apple had shipped iOS 14.5 and turned on App Tracking Transparency — a dialog box asking users whether an app could track them across other companies’ apps and websites. Meta’s CFO told investors the change would cost the company something like $10 billion in 2022 revenue.

Worth flagging: that figure was an estimate, and Wehner said so at the time, noting they couldn’t be precise about it. Meta’s own annual filing later attributed the revenue decline to macroeconomic conditions along with targeting and measurement limits, among other factors. The $10 billion number gets quoted as fact far more often than it deserves.

But the direction was real, and the mechanism is the point of this final article. A single company changed a default setting, and the targeting infrastructure that Part 7 described being built over a decade became substantially less reliable overnight.

That’s where paid search stands now: a business whose two foundational assumptions — that you can track people, and that people click through to websites — are both under pressure at once.

The measurement squeeze

Three forces hit in sequence.

Regulation. GDPR took effect May 25, 2018; CCPA on January 1, 2020. Consent management platforms became standard infrastructure. Google’s Consent Mode v2 began enforcement for European traffic in March 2024, adding two signals beyond cookie storage: whether user data can be sent to Google at all, and whether it can be used for personalization.

Apple. ITP progressively blocked third-party cookies in Safari, complete by 2020. Then ATT in April 2021. A study published by the FTC found ATT reduced the share of trackable US Apple traffic by 55 percentage points, from 73% down to 18%. Opt-in rates get cited constantly and vary wildly by methodology — Flurry measured about 4% in the US across all users; Kochava measured 48.8% among users actually shown the prompt. Cite the study or don’t cite a number.

Google’s cookie saga, which ended in a shrug. Google announced a two-year third-party cookie phase-out in January 2020, proposed FLoC, replaced it with Topics, delayed in 2021, 2022, 2023, and 2024, restricted cookies for 1% of Chrome users in January 2024, and then on July 22, 2024 announced it would not deprecate third-party cookies at all. Anthony Chavez’s framing was that instead of deprecation, Chrome would introduce an experience letting people make an informed choice. In April 2025 Google confirmed it wouldn’t even add a new prompt. Privacy Sandbox effectively wound down.

Four years of industry-wide preparation for an event that never happened.

The response, everywhere, was the same: move measurement server-side and lean on first-party data. Google’s Enhanced Conversions, Meta’s Conversions API, offline conversion imports from CRMs. Instead of a browser cookie reporting what happened, your own server sends hashed customer data directly to the platform. That’s the current architecture, and it’s why “do you have server-side tracking” became a real question to ask an agency.

Two monopoly rulings

Google lost twice.

The search case. DOJ filed in October 2020. After a nine-week trial, Judge Amit Mehta ruled on August 5, 2024, in a 277-page opinion, that Google is a monopolist in general search and general search text advertising — controlling roughly 90% of desktop searches and 95% of smartphone searches. His sentence: Google is a monopolist, and it has acted as one to maintain its monopoly.

Remedies came September 2, 2025. Mehta declined to force a Chrome divestiture. He banned exclusive default agreements, ordered Google to share portions of its search index and user interaction data with qualified competitors — notably not advertising data — and installed a six-year technical oversight committee. Final judgment landed in early December 2025. Google is appealing.

The ad tech case. DOJ filed in January 2023 in Virginia. On April 17, 2025, Judge Leonie Brinkema ruled that Google illegally monopolized the publisher ad server and ad exchange markets by tying DFP and AdX. Her finding: the conduct harmed Google’s publisher customers, the competitive process, and ultimately consumers of information on the open web. DOJ proposed structural remedies including divesting AdX; closing arguments on remedies ran in November 2025. Google is appealing that one too.

Europe ran parallel. €2.42 billion for Shopping in 2017, €4.34 billion for Android in 2018, €1.49 billion for AdSense in 2019, and €2.95 billion for ad tech self-preferencing on September 5, 2025 — with an explicit warning that structural separation remains on the table if remedies fall short.

For a contractor spending $8,000 a month, none of this changes tomorrow. What it changes is the ten-year picture: the assumption that Google can set the terms unilaterally forever is now a legal question rather than a settled fact.

AI eats the click

The last shift is the one still in motion.

Google announced Search Generative Experience in May 2023 and shipped it as AI Overviews in May 2024 — generated answers at the top of the results page, synthesized from multiple sources. Ads went into AI Overviews in 2024. In May 2025, at Google Marketing Live, Google expanded ads in AI Overviews to US desktop and began testing ads in AI Mode, the conversational interface.

You cannot opt out of appearing in AI Overviews, and you don’t get segmented reporting on it. Your Search, Shopping, and Performance Max ads are simply eligible.

On the campaign side, AI Max for Search was announced at the same event and rolled out through 2025 into general availability. It bundles broad matching, dynamically generated ad copy, and automatic landing page selection — the endpoint of everything in Part 9. Meta’s Advantage+ and Microsoft’s Copilot integrations run the same play.

The structural question is what happens to the click. Paid search has always depended on a person reading an answer they didn’t fully trust and clicking through to find out more. When the answer arrives complete at the top of the page, fewer people click. Estimates of how often AI Overviews appear circulate widely — one agency figure put it above 35% of searches in late 2025 — but these are vendor estimates, not Google data, and should be treated accordingly.

What isn’t disputed is direction. Informational queries increasingly resolve on the results page. Transactional queries — “who can come fix this today” — still produce contact, which is why service businesses are better insulated than publishers.

The return of brand

There’s a conclusion here that sounds soft and isn’t.

When targeting is precise and measurement is exact, the advertiser with the best account structure wins. When targeting degrades, measurement gets modeled, and the auction becomes a black box, the advertiser with the strongest brand and the clearest offer wins — because those are the inputs the machine can still read, and because a person who already knows your name behaves differently in every auction you enter.

Les Binet and Peter Field’s IPA analysis, drawn from 996 case studies across 700 brands and 83 sectors over three decades, found that brands optimizing for long-term growth allocate roughly 60% of spend to brand building and 40% to sales activation. That research predates all of this. It’s more relevant now than when it was published.

For a home service company, “brand” isn’t a logo exercise. It’s review volume, name recognition in a service area, trucks people have seen, and a reason to call you rather than whoever ranks first.

What this means for your account

Own your data. Your customer list, your CRM, your call recordings, and your booked-job history are now the targeting and measurement substrate. Cookies aren’t coming back in any dependable form, and platform-reported conversions are increasingly modeled estimates. Enhanced Conversions and offline conversion imports are not advanced tactics anymore; they’re baseline.

Assume less traffic from organic. As AI Overviews answer more questions on-page, the free visibility your website used to earn shrinks. Paid placement and Local Services Ads become a larger share of how people find you, not a smaller one.

Don’t optimize for the metric you can see at the expense of the outcome you want. Modeled conversions, view-through credit, and platform-reported ROAS all trend generous. Holdout tests and your job calendar are the honest instruments.

Spend something on being known. Reviews, referrals, yard signs, local sponsorships, a memorable name. In an auction that increasingly rewards predicted engagement, being the company a homeowner already recognizes is a bidding advantage you can’t buy directly.

Carryover: the vocabulary that survived

Terms established in this era and the instruments they became.

GDPR / CCPA · 2018–20: The first major privacy regimes affecting ad targeting. Consent banners, consent mode signals, and regional measurement gaps.
App Tracking Transparency · 2021: Apple’s opt-in prompt for cross-app tracking. The reason app and social attribution runs on modeling rather than deterministic IDs.
Consent Mode v2 · March 2024: Google’s four consent signals. Required for full measurement and remarketing on European traffic.
Privacy Sandbox · 2019–24: Google’s cookie replacement proposals. Effectively wound down; third-party cookies remain in Chrome.
First-party data · 2018–26: Customer data you collected yourself. The primary targeting and measurement input across every platform.
Enhanced Conversions · 2021: Hashed first-party data sent server-side to Google. Standard setup for any account serious about measurement.
Conversions API · 2020: Meta’s server-side conversion reporting. Standard alongside the pixel, not optional.
Modeled conversions · 2018–26: Statistically estimated conversions where tracking failed. A meaningful share of what your reported conversions actually are.
AI Overviews · 2024: Generated answers atop search results. An ad surface you’re eligible for and can’t opt out of.
AI Max for Search · 2025: Google’s bundle of broad matching and generated assets. The current endpoint of automation in Search campaigns.