But it is walled. If you use Gitlab and I use Gitea, I can't submit a PR from a Gitea fork to your Gitlab repo. I have to create a Gitlab account or host my own

But it is walled. If you use Gitlab and I use Gitea, I can't submit a PR from a Gitea fork to your Gitlab repo. I have to create a Gitlab account or host my own Gitlab server. Because it's not interoperable, it's a walled garden.