And how do they login on the Android phone with the Apple ID with no changes to the Android app? That's the question OP didn't understand and which your reply completely ignores. While this is an iOS change, it will have effects beyond just iOS.
I think most of us are fully aware an Apple ID survives even if you have no Apple devices without recourse to Apple help links.
I think most of us are fully aware an Apple ID survives even if you have no Apple devices without recourse to Apple help links.