How does account recovery work?
Re:How Popular Is “Sign in with Apple”?
by corylulu on Tuesday January 28, 2020 @01:20PM
(#22172356)
If you signed in the Apple, it would be through Apple's recovery process.
Sounds like it is good for privacy, unless Apple decides to snoop?
If you're using iOS or macOS, Safari, etc. you're already trusting them significantly. This avoids introducing a third-party who otherwise would not be involved in the session.
https://support.apple.com/en-us/HT210318
In essence, Apple generates a unique email address through their relay service that forwards to (and thus hides) your actual email address. It was widely considered a pretty major step in the right direction for user privacy.