How easy is it to get information out of GitHub? Not just the repositories -- cloning a git repo is easy -- but the issues, wiki pages, and so on. If that's made as easy as possible, then escaping from GitHub-gone-wild shouldn't be too hard.

That in itself should provide an incentive for GitHub to avoid alienating its users. It's like bringing an umbrella so it won't rain, in a world where such things actually worked.