I wrote for Naavik about Apple’s upcoming enforcement of App Tracking Transparency (ATT) and what it means for the mobile ecosystem. Read the full article here.

Why I wrote about this

With iOS 14.5 around the corner, ATT was about to shift the foundations of mobile advertising and measurement. The industry had spent months speculating, lobbying, and scrambling to prepare. I wanted to break down what was actually happening and why some of the “quick fixes” being discussed were unlikely to work.

Most importantly, my own business, Lightheart’s Mr Autofire, was very likely to be affected by the changes.

The gist of it

Apple’s App Tracking Transparency framework requires apps to ask users for explicit consent before tracking them across other companies’ apps and websites. If users decline, publishers lose access to the IDFA and are prohibited from using alternative fingerprinting techniques. In practice, this undermines the traditional tools used for user acquisition targeting and ROI measurement.

The lead-up to enforcement was chaotic. There were rumors of fingerprinting workarounds, rejected SDK updates, and a general scramble to prepare for Apple’s SKAdNetwork (SKAN) attribution system. The SKAN itself was (and is) plagued by design and operational limitations. Despite the industry’s efforts, few were truly ready, including Apple.

Some hoped high opt-in rates would soften the blow. But relying on a consented subset of users introduces heavy selection bias, requires opt-in on both ends of the attribution chain, and looks far weaker in gaming than headline averages suggest.

In reality, ATT forces a structural shift: toward aggregated data, probabilistic thinking, broader product appeal, and owning more first-party data. While positioned as pro-consumer, ATT may ultimately concentrate data power in the hands of platform owners and scaled incumbents.

Key takeaways

  • ATT effectively dismantles IDFA-based targeting and deterministic attribution for non-consented users.
  • Opt-in rates alone are misleading and insufficient for reliable campaign measurement.
  • SKAdNetwork was (and is) lacklustre.
  • Success in a post-ATT world requires adapting to aggregated data and earlier optimization signals.
  • In the long run, ATT may reinforce data monopolies rather than level the playing field.