https://arstechnica.com/gadgets/2020/09/facebook-complains-apple-responds-ios-14s-big-privacy-change-gets-postponed/

Apple has postponed full enforcement of a feature of its upcoming iOS 14 software for iPhones that would require app developers to request users' permission to track them across apps for advertising purposes. This announcement comes in the wake of a public complaint from Facebook that the privacy policy could negatively impact the ad market in Apple's ecosystem.

The feature, announced at Apple's annual developer conference in June, would require app developers to notify a user of an app's intent to track the user's IDFA (ID for Advertisers). IDFA is used to track the user's behavior across multiple apps and deliver targeted ads based on that behavior. The change would also require the user to opt in to that tracking.