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Presumably Apple won't let just anyone put the "Sign in With Apple" button on their website, or will at least have a method of blocking bad actors.

Then you get kicked out of the App Store.

(potentially)

This sounds like a way to get your app rejected for abusing APIs.

In an app I agree. On a website signup however..?

It would work roughly the same way. Integrating an OAuth provider like this requires registering an application with revokable ClientIDs, so Apple can technically pull them just as easily as they can pull Apps.

(It remains to be seen if they'll put in the legwork to actually police these things, though)

This is going to be a tough sell to your marketing dept I think.

Is it though? Think about zuckerberg's "dumb fucks" quote.

It's usually the marketing department asking for e-mail addresses in the first place.

> ‘Error: We love Apple and anonymity but we require a real email address to prevent fraud and to properly secure your account. Please enter your real email address.’

GDPR would probably want to know specifically why you need someone's real email address.