Yeah, thats part of why I hate "login with SERVICE". The big benefit would be not spamming me, but they always insist on getting my email.
There was a time were you would have to select "sign me up for your newsletter" then you had to uncheck it. Then you had to check to not get an email and now you don't even get that choice.
And lately? You have to go dig through your email because you can't set a password (looking at you Claude), so you can't filter email.