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Re:How Popular Is “Sign in with Apple”? by smlacy on Tuesday January 28, 2020 @01:19PM (#22172340)
"Utterly private" is a very odd term here.

At the very least, Apple knows which sites you're signing into, and has the unique e-mail addresses used at those sites, and has likely issued the authentication tokens for those sites. I'm not sure what's "utterly private" about this setup.

Re:How Popular Is “Sign in with Apple”? by scarface74 on Tuesday January 28, 2020 @01:26PM (#22172445)
You are already trusting Apple regardless if you are using iOS.
Re:How Popular Is “Sign in with Apple”? by corylulu on Tuesday January 28, 2020 @01:35PM (#22172553)
Your email isn't revealed to the site, so it's privacy from the site you are signing into. Although I'm sure they are still requesting basic info like name and potentially age.