The rollout of ATT in iOS 14.5 has changed how the mobile ad industry approaches monetization and measurement

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AppTrackingTransparency (ATT) affected the vast majority of iOS users. As of December 2021, 89% of US iOS users were on version 14.5 or later, per AppsFlyer. Of those that have seen the ATT prompt, 37% opted in, according to the company. That's higher than initial industry expectations but still a massive decrease in trackable users.

That number may also be a bit misleading. Both publishers and advertisers need to get consent, so users who only accede to one request may still be untrackable. Plus, the opt-in rate doesn't account for users that turned on Apple's previous opt-out tool, Limit Ad Tracking (LAT), and aren't served the ATT prompt at all. AppsFlyer estimates around 30% of global iOS devices had LAT turned on.

Platforms that rely heavily on third-party data feel it the most. That includes Big Tech companies with large off-platform ad businesses, such as the Meta Audience Network or Snap Audience Network. Meta CFO Dave Wehner said in the company's Q4 2021 earnings that ATT could cost the company $10 billion in ad revenues in 2022. Meanwhile, platforms that rely mostly on...

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