Its great that they are not trying to be a universal replacement for Github but something more focussed to their community. That will encourage others to spin up their own Forgejo instances and that decentralisation is a feature not a bug.

They don’t need to host everything and everybody. That kills community. They are even spending money on developing activity pub federation, just like here.

I’m not familiar with how this federation is supposed to work specifically, but does that mean in theory that you could still contribute to projects that do contain cryptocurrency through a Codeberg account?

Well not any more (your question is a bit bizarre).