Except that the git is the least important part of GitHub. The real value is in the community and the extra services that it provides around the git source cont

Except that the git is the least important part of GitHub. The real value is in the community and the extra services that it provides around the git source control system. To move away from GitHub one would have to not only clone the repository (and all of the branches, tags, etc), but also scrape off the Wiki, Issues, and contact information of contributors. Then they would need to set up an alternative with a similar security infrastructure and notify everyone relevant to its existence.