Does the code really need to be hosted in a central location like this? (Clearly not, which is why people are leaving GitHub in the first place)

But the one part GitHub provides that's genuinely valuable is the social aspect, and when you get a PR from a user named torvalds you can trust that this is in fact Linus. This isn't the case with more distributed systems.

That's why I'd really like to see some entity handle just the auth/identity providing. Forgejo/ Gitea/ Gitlab instances can then choose to use that. Then, for example if you want to take on another contributor and they have their own forgejo instances, you can invite them through this provider, when they fork your repo it ends up in their own forgejo, and they can easily create PR's into your repo.