https://wccftech.com/apple-is-delaying-ios-14s-advertising-privacy-feature-to-early-next-year/

Apple told some developers that it will delay its advertising privacy feature in iOS 14 to early next year. The feature requires apps to seek user permission before IDFA can track their behavior and preferences across websites and apps. This was merely implemented to ad targeting purposes that Facebook heavily criticized in the past weeks.

Facebook and other major ad networks bashed Apple against the new privacy feature openly. Facebook warned advertisers on its platforms that if the change is implemented, it could potentially cause a more than 50 percent drop in Audience Network publisher revenue due to loss of ad personalization.