Give me one single example of Apple changing the T&Cs and then retroactively removing Apps that are in violation of the new T&Cs.

Every single time Apple removed an App from the App Store is because the new version was somehow in breach of the T&Cs.

You could say that the rules was applied unfairly to Hey but nonetheless the T&Cs were clear as day about off platform signup/payments because it protects consumer from sham companies.

Apple kicked Blix out of the App Store, just before releasing sign in with Apple. Blix was an anonymous sign-up service.

When Catalina was released, they kicked out Luna and Duet after having copied their features in Sidecar.

When they released Screen Time, they kicked out similar apps from the App Store, despite being here for years.

The list is endless.

This one situation with Epic is about Apple disabling "Sign In With Apple".

This is not just about disabling "sign in with Apple".

which has also never happened (excluding Epic)