Yeah interesting idea. I can see it being useful for private enterprise implementations of gitlab to contribute to upstream projects… I don’t think it’s possible to fork a public github.com repo to a self hosted github enterprise instance but it’s been a while since I’ve run that and I don’t remember ever actually trying.
It might make tooling easier… I can see it being pretty easy to setup bi-directional comms with non-gitlab CI/CD pipelines doing this.
Really it might entirely eliminate the need for service accounts or whatever the gitlab equivalent of Github Apps is too which would be wonderful.
You are going to need hosting no matter what.