even the gitea people are using github for development. The reason they mention on the migration issue is, that not all features needed are ready. They e.g. implemented issue deletation a few months ago.
Actually,data gravity is the issue, not features. https://github.com/go-gitea/gitea/pull/18165 needs to be merged to be able to leave Github.
I think the code an pull requests are easy migrated manually. The 2k open issues would have to be cleaned up first. Then migrate the remaining issues via api. One issue could be the non existing user on the import side.
Is there another pithy term that means this that I can use?