I think the difference is that with a Facebook or Google login, companies could also easily just require that they get permission to see the user's email address (which isn't super uncommon to see with OAuth logins), so they wouldn't need continual access to OAuth after the first login (unless a user switched to a new email address and stopped checking the old one, which I think is somewhat rare).
I totally agree with your point that this is arguably a good thing, though; although I don't personally own or use any Apple products, there are fairly few services I'd want to sign up for that I'd want to ensure that they had my real email, and I'd be happy to make sharing my email address an opt-in choice rather than the default.
I totally agree with your point that this is arguably a good thing, though; although I don't personally own or use any Apple products, there are fairly few services I'd want to sign up for that I'd want to ensure that they had my real email, and I'd be happy to make sharing my email address an opt-in choice rather than the default.