Google details the impact of Apple's upcoming IDFA ad privacy changes, including reducing visibility into app install metrics and affecting bidding on some ads
Context & Ripple Effects
Apple set this in motion in June 2020 when it announced the IDFA would become opt-in with iOS 14, turning a tracking identifier marketers treated as infrastructure into a permission prompt. By December the ad industry was bracing for the change and testing replacement targeting methods, and Google had already quietly updated AdMob documentation to say it would trigger Apple's ATT prompt through its own SDK.
What changed today is that Google — the largest buyer- and seller-side intermediary in mobile ads — has put specifics on the damage: reduced visibility into app install metrics and degraded bidding on some ads. That matters because Google's disclosure effectively becomes the industry's damage assessment, and it sets up the question of whether Google follows Apple's lead on Android.
First-order effects
- Advertisers buying iOS installs through Google's ad tools lose reliable install-attribution data, weakening their ability to measure campaigns and bid accurately on iOS inventory.
- App publishers monetizing through Google's network face softer bid prices on iOS traffic as buyers discount inventory they can no longer measure.
Second-order effects
- Budgets rotate toward measurable inventory — a shift later confirmed by Post-IDFA Alliance data showing Android ad spending up roughly 21% while iOS spending slipped and most iOS users opted out of tracking (Android up ~21%, iOS down ~3%).
- Google faces pressure to decide whether Android adopts comparable privacy prompts; reporting indicates its plans to match Apple's ATT changes were delayed over concerns about diminishing its own mobile ads business (Google's ATT-matching plans delayed).
Third-order effects
- Measurement and bidding power consolidates with whoever controls the operating system: Apple and Google become the arbiters of what attribution exists, replacing third-party identifiers with platform-gated APIs.
- If opt-in consent becomes the default gate across both mobile platforms, ad-tech intermediaries compete on first-party data and contextual signals rather than cross-app tracking — a structural rewiring of how mobile ad budgets are priced and allocated.
The trend: Mobile advertising is being restructured around operating-system-level privacy gates, with Apple's IDFA decision forcing Google, advertisers, and publishers to rebuild measurement on platform-controlled terms.