git SSH remotes are easy, complete and practically free to host, with many features that GitHub doesn’t offer (like reflog, backup, updateOnPush, rebase & subtree), though you have to get comfortable with PR & code review via email or text file.

Sourcehut aka sr.ht is a free email-driven GitHub alternative. If you like email patches flows instead, check that out.

SSH unleashes the true distributed nature of git. With confidence you can move commits across instances , pushing to various repos. You can build some very flexible publishing and archiving patterns with git alone.