@hund@linuxrocks.online
The biggest obstacle to self hosted gitea or gitlab is contributing across self hosted servers.

https://github.com/forgefed/forgefed (I see the irony) is a project that aims to extend ActivityPub for use with Git.

https://discourse.gitea.io/t/forgefed-federation-in-gitea/1157 there is some discussion with implementing forgefed in gitea

https://gitlab.com/gitlab-org/gitlab-ce/issues/4013 there is an issue in gitlab for tracking interest and work on federating.

We will get there.