But please answer this question: how does using Github make you "less free"? All parts of Github (even parts of the web interface, like the wiki) can be used stand-alone. All your data can be easily dumped, most of them in a ready-to-reuse form (the git repositories, the wiki and github pages). So, from lock-in perspective, gitorious and github are quite alike. What exactly is it that makes you, as an individual, less free then using gitorious? Sure, the software is less free, but your data: not so much.
What does that mean? Github is not some function/feature that you support?
Yes. It's not difficult and means you can accept pull requests from both Mercurial and Git users.