That's probably like 30% of the uses of OAuth (e.g. granting Azure Pipelines access to your GitHub repos). 70% is just outsourcing identity and authentication (log in with Google / Facebook / etc.) In those cases the only data they access is your email, profile image, etc.

As a website developer I would definitely appreciate something like OpenID but actually usable/popular. Having to implement a ton of "log in with"s sucks, as does implementing email based login.