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If you are a closed org, that is. Running your own gitea or gitlab with registration enabled and having to deal with spam is a real hurdle.

Is it not possible to restrict access to the git server from a VPN server only?

Just off the top of my head, that's one thing you can do.

Yah, that's a "closed org". When you need to deal with the public at large, you need to deal with user registration issues and spam.

So now every person who wants to contribute to your open source project has to setup a VPN client?

The parent comment was explicitly about non-closed (e.g. private) orgs.