Same; I was a sucker for GitHub SSO as well. I have no idea how to unwind it all, but (like Google SSO) it certainly had its benefits while I was using it. I remember there was an “open” SSO provider - OpenID maybe - back in the 2000s when a federated identity made interacting with blogs and such much easier. It’s the same with GitHub today, with various 3rd parties who need access to your code. They don’t have a “give me an git+ssh url” and so you almost need GitHub.