2nd on how hide email kind of over my head. Though, there are a few place maybe I would like that.. though probably easier to just have a dummy gmail/ forwarded email? Looks sort of complicated, but maybe I'm wrong.
The second method is actually pretty easy, but the site has to offer Login with Apple ID
as an option, like the more ubiquitous "Login with Facebook" and "Login with Google". Login with Apple is new but the number of sites is growing.