I have repos in GitHub Enterprise Server which are WELL OVER 100x what you say the limit is.

There is not a technical limit of 4GB per repo on github.com. maybe a private repo size limit if you are not a paying customer, but it is not a technical limit of the platform, I assure you.

There is a 4GB limit on a single push, but you can work around that by pushing a very large repository incrementally. I have done that in the past for a repo with a linear history: push the first N commits, then the next N commits, etc. It would be harder for a repo with many refs or a branchy history; maybe limit each push by commit date?

WDYM by 4GB size limit? When I run du -h on my linux checkout, I get 6.4G (no build artifacts, just git tracked source code plus the .git directory). Even if I only look at the .git/objects directory, it's 5.2G large.

Lol. That's tiny. Monorepos of MAANGs are multi TiB.

As people have pointed out, there's not a hard 4GB limit. They do recommend less than 5GB.

You could if someone contacted GitHub to have it mirrored.