https://techcrunch.com/2021/04/26/apples-app-tracking-transparency-feature-has-arrived-heres-what-you-need-to-know/

iOS 14.5 — the latest version of Apple’s mobile operating system — is launching today, and with it comes a much-discussed new privacy feature called App Tracking Transparency.

The feature was first announced nearly a year ago, although the company delayed the launch to give developers more time to prepare. Since then, support for the feature has already gone live in iOS and some apps have already adopted it (for example, I’ve seen tracking requests from Duolingo and Venmo), but now Apple says it will actually start enforcing the new rules.