I've been reading a lot of discussion about the Apple Sign In in the past few days and none of the comments mentioned the following: if you use Apple Sign In, y

I've been reading a lot of discussion about the Apple Sign In in the past few days and none of the comments mentioned the following: if you use Apple Sign In, you will only be able to use it to access your account(s), because it will (if I understood correctly) generate different email addreeses for each OAuth consumer service. Right now, if I want to, I can log in using either Google or Twitter as long as the web app supports it, because Google and Twitter both give the service the same email address. Now, I realize the whole point of this is giving more privacy to the end user, but it also locks in the end users to use only Apple Sign In for all services they logged in once via Apple Sign In. As somebody mentioned it already in a different thread, it would've been so much better if there was an open standard for this...