GitLab is open source, you can self host it. Although the system requirements are quite high, you will not be able to host it on a two euro VPS. And I wouldn’t

GitLab is open source, you can self host it. Although the system requirements are quite high, you will not be able to host it on a two euro VPS. And I wouldn’t be that concerned about contributors. It’s only the very top projects that get any contributors. And even then most of the time contributors are not worth the hassle.