Agreed wholeheartedly. It has been a long time since I've run into a site that doesn't have an "or sign up with your email address" option, but whenever I do, I just decide not to bother. I don't really want any of my accounts tied to each other if I can help it.
If you use gmail, is "Sign in with Google" tying accounts together any more than "or sign up with your email address"? Don't they both mean you're relying on your google account/gmail address existing?
I do wonder if it would be useful to use my Auth0 personal account for this type of thing on sites that support it instead of using email login. I think a dedicated identity provider might be less risky in terms of random account freezing. Google, Microsoft and Github probably have a zillion ways (valid and invalid, accidental or not) you can violate TOS because they all own platforms for publishing content. A dedicated identity provider might be safer in that regard.
