Apple’s app tracking transparency feature isn’t an instant privacy button
A report from the Financial Times acts as a reminder of what Apple’s App Tracking Transparency settings do and do not do to protect your privacy (via Ars Technica). While asking apps to not track you does keep them from collecting and selling data tied to your personal advertising identity, it doesn’t keep developers from collecting any information about you at all.
The feature, introduced in iOS 14.5, is meant to prevent app-makers from tracking what you do and selling that information to advertisers. Companies like Facebook cried foul when it was introduced, saying that it would hurt their ability to show targeted, personalized ads, and therefore hurt businesses that relied on those ads.