Apple finally released its much-anticipated App Tracking Transparency feature with the launch of iOS 14.5, and it’s incredibly helpful if you want some fine-grain control over which apps can track other aspects of your digital activity. That’s assuming, of course, the feature isn’t grayed out for you.
source https://lifehacker.com/how-to-fix-your-iphones-app-tracking-transparency-if-it-1846782530