Somebody started this project a while back but I don’t think it’s live any more https://github.com/Flockingbird

I did this, we used https://masto.host/ and prevented other registrations. You can also make the posts invisible to people who aren’t logged in

I succeeded using linkding which I’m hosting on pikapods https://github.com/sissbruecker/linkding https://pikapods.com/

Another one here. Inveterate distro hopper now firmly anchored with fedora