The other thing that would improve the chances of me completing the sign-up flow is not asking for more information than absolutely needed. If I log into a site with my Google account, it's because I didn't want to pick a username, add yet another password to my password manager, or give you my email address.
I actually have no idea. I would think so but I know I've been asked to enter it, at least on some sites.
But if they do get the email address, it would be nice if Google gave them some sort of proxy address and required that anyone using Google sign-in accepted that address instead of requesting the real one.
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".
