An app that exclusively offers third party sign in.. not all apps. Apple is forcing choice: it isn’t going to allow an app that only allows Google for sign in (and not email.) That’s a win. Apple is saying that you can’t only offer Google sign in. If you allow standard email/password you don’t have to allow Sign In with Apple. Apple says: “either allow normal sign in or, if you only allow 3rd party, then one of the choices should be Apple.

Basically Apple says: you are required to offer choices and you can’t force users to only use Facebook/Google. A big difference and a big win for choice.