Look, I'm aware of the point of Gitea/etc. I also don't really care. I want people to be able to easily contribute so they don't give up and just go back to Gi

Look, I'm aware of the point of Gitea/etc. I also don't really care. I want people to be able to easily contribute so they don't give up and just go back to GitHub. OAuth with a GitHub access level solves this, full stop. A proper federation protocol is correct and the right option long term but there is no need to knock what actually works right this moment. Doing the right option often takes far longer than is ideal.