Is there really nothing like BitTorrent for git, or have we just not heard about it because of GitHub's network effects? It feels like this problem was solved long ago for binaries.
HardenedBSD Is Now Officially on Radicle
The main difference was atproto wanted to tackle scale, so we went with a servers & aggregation model. Radicle is going for device-to-device networking as a primary goal.
the issue isn't mirroring of data, this is a solved problem. everything else that a forge does is a problem - issue tracking, PRs, reviews, CI/CD, authn, authz, secrets, audit trails, ...