If the App Store guidelines say you need to implement Sign in with Apple, and you implement it such that proxy email addresses are rejected, you'll likely be told by Apple to fix it per the developer agreement.
These proxy email addresses are supposed to be pseudonymous, one per apple id + app team, and are set to relay to a verified email address associated with that apple id.
Authentication will tie back to an associated physical apple device, although you can have one device associated with more than one Apple ID.
These proxy email addresses are supposed to be pseudonymous, one per apple id + app team, and are set to relay to a verified email address associated with that apple id.
Authentication will tie back to an associated physical apple device, although you can have one device associated with more than one Apple ID.