Apple does this, Google doesn't. Signing up with your Google account may also allow the app to see way more than you might want - always check the permission request. "Read your e-mails" and "Post videos on YouTube" may well be in there.
It would be a great move for Google to offer something like Apple's proxy sign-up.
The only way those permissions are sneaking by me is if I sneeze right when the page shows up so my eyes are shut and the movement causes me to accidentally click "allow".
It would be a great move for Google to offer something like Apple's proxy sign-up.