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PSA: git repo can be hosted without a "provider" and any ssh address is a valid origin url: https://git-scm.com/book/en/v2/Git-on-the-Server-Setting-Up-...

For which team would be a plain git server enough to manage a codebase?

The Linux kernel team

GitHub is a git server as a service.

+ issues + pull requests. There’s some nice to haves in there, that you’d need some other service or convention to manage