Apple Announces the Tracking Prompt, Then Delays It

At WWDC20 Apple announced that apps would need permission to track users across other companies' apps and websites, starting with iOS 14 that autumn. In September it delayed enforcement to early 2021 to give developers time to prepare. The prompt arrived with iOS 14.5 in April 2021.

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In short: Opt-in tracking announced for iOS 14, then pushed to 2021

What Changed

Apple announced the change at its developer conference.1 With iOS 14, apps would need users' permission before tracking them across apps and websites owned by other companies, or before accessing the IDFA. The prompt was the core of what Apple called App Tracking Transparency.

The strongest early reaction came from Facebook. On August 26, 2020, it said it would not collect the IDFA in its own apps on iOS 14, and warned that the change might make its Audience Network, which places ads in other companies' apps, so ineffective on iOS 14 that it might not make sense to offer it. In Facebook's own test, publisher revenue on Audience Network fell by more than 50% without personalized ads. It also told app advertisers to run iOS 14 install campaigns from a separate ad account, so that the aggregated reports from SKAdNetwork, Apple's privacy-preserving attribution framework, stayed apart from everything else.2

On September 3, 2020, shortly before iOS 14 shipped, Apple said that to give developers time to make the necessary changes, apps would be required to get permission to track users starting early the next year.3 iOS 14 launched without the requirement.

Why It Mattered

The delay gave the industry about seven months to prepare. Ad networks and attribution providers worked on SKAdNetwork and on new ways to model campaign performance without user-level data. Facebook, now Meta, ran full-page newspaper ads in December 2020 arguing that the change would hurt small businesses that relied on its ads.4

The months between announcement and enforcement also set up later disputes. On October 23, 2020, four French advertising associations, including IAB France, asked France's competition authority to act against the framework before it took effect. The authority declined to impose interim measures on March 17, 2021, but kept investigating the case.5 It fined Apple in 2025.

Enforcement began with iOS 14.5 on April 26, 2021.

Notes

  1. “Apple Reimagines the iPhone Experience with iOS 14,” Apple Newsroom, June 22, 2020, https://www.apple.com/newsroom/2020/06/apple-reimagines-the-iphone-experience-with-ios-14/. ↩
  2. Allison Schiff, “Facebook’s IDFA Plan: Possible Audience Network Shutdown for iOS 14,” AdExchanger, August 26, 2020, https://www.adexchanger.com/mobile/facebooks-idfa-plan-possible-audience-network-shutdown-for-ios-14. ↩
  3. “Details for App Privacy Questions Now Available,” Apple Developer News, September 3, 2020, https://developer.apple.com/news/?id=hx9s63c5. Announces the delay to early 2021. ↩
  4. Kurt Wagner, “Facebook Attacks Apple’s Changes to iOS 14,” Fortune, December 16, 2020, https://fortune.com/2020/12/16/facebook-attacks-apple-software-changes/. ↩
  5. “Decision 21-D-07 of March 17, 2021 Regarding a Request for Interim Measures in the Sector of Advertising on Mobile Applications on iOS,” Autorité de la concurrence, March 17, 2021, https://www.autoritedelaconcurrence.fr/en/print/pdf/node/7701. ↩

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