I think once Codeberg becomes federated, it will likely attract a lot of people.
Right now github is great for discovering and tracking projects, reflecting growth via the star and fork system (although a bit broken in the last few years).
If a federated layer is applied to these github alternatives, you could have an account in Codeberg, and be able to track lots of projects wherever people want to host them. Right now, I see a lot of forgejo servers, but I don't want to register in all of them.
+1 - I also see a huge opportunity for forgejo to become a new stackoverflow if they add federation
The primary issue with SO was that it was disconnected from the actual communities maintaining the project. A federated solution would be able to have the same network effects while handing ownership to the original community (rather than a separate SO branch of the community)