I wonder if there's a place for something like matrix, but for repositories (or maybe matrix protocol can handle that?). A world where we have selfhosted, saas, etc, but all interlinked and searchable? Say I find a project on gitlab, I want to contribute to, I checkout to my personal server (or someone elses hosted), and raise a pr back to original repo. I know it doesn't answer your question, just thinking aloud really.

tangled, forgejo, radicle, sourcehut - to name a few

Different places. Stop centralising the web. Embrace diversity.