"Sign in with X" buttons all suck anyway. Why lose access to just one account when you can lose access to dozens? Use a password manager.
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.
Accounts are only necessary if I actually have to maintain content on the site, or specific permissions are tied to my account.
What makes me unhappy are the services that don't support non-oauth accounts at all, e.g. ProductHunt.
You have one account with stronger sec. Like 2fa instead of 10 random accounts without 2fa cuz you dont want to give ya phone number to untrusted ppl