Comment by mdaniel
What is the threat model against which you are protecting version control? It seems like you are either thinking about using GitHub as just a backup system, which is almost certainly better solved by actual encrypted backups, or posting encrypted patches to a mailing list to just collaborate with your friends
My primary motivations...
1. I'd like to store code without a company using my code to train their language model.
2. I'd like to store code without a company deciding my code's merit (Github removing youtube-dl, Sourcehut not allowing crypto projects, etc).
3. Something about storing private code on a closed source forge feels wrong. It also feels wrong that company can read my code, and any of its employees can.