Oddly enough, their license which prohibits any sort of standard corporation setup from hosting or making copies of the software, would seem to prohibit their own source code being on their own Github.

It also rules out Gitlab.

I suspect they can not use any commercial host such as AWS or OVH either.

As a self hoster, I don't think even I would be able to host this - I use cloudflare and would be sending source code materials to be copied by cloudflare.