[L3viathan]

You make a good point, and in general I agree, but it introduces additional headaches if I think about logging in from a non-Apple device later.

[lilyball]

You actually can support Sign In With Apple from arbitrary platforms, using the JS API.

https://developer.apple.com/documentation/sign_in_with_apple...

This is obviously the most useful for websites, but Apple’s developer site links to this with the descriptor “for web and apps on other platforms” so clearly they’re ok with Android apps using it too.