Some iOS users have reported that apps like eBay and Microsoft Outlook block features unless they enable app tracking.

Apple introduced App Tracking Transparency in 1OS 14.5, which allows users to prevent apps from sharing their information with third parties. Since its rollout, every app in the App Store must comply with this tracking policy and cannot treat users differently, regardless of whether they have opted in or not. However, some iOS users have reported that certain apps have violated these terms and are essentially trying to force them to enable app tracking.

So far, eBay appears to be the biggest culprit. The iOS app is said to outright reject third-party logins from Google accounts and the like, stating that Google Sign-In requires app tracking to be enabled in order to work. This has many users, like The Verge's editor-in-chief Dieter Bohn, wondering what's going on.

According to Rob Leathern, Google's vice president of privacy product management, Google Sign-In does not collect data for advertising or tracking purposes. He responded to Dieter's Twitter post, "We make it clear in our instructions for Google Sign-in for iOS that this data is not used for tracking. Hope this helps!" He did not clarify whether Google Sign-In requires app tracking to be enabled, or whether eBay's claims are true.