While I agree with the sentiment, GitHub is like crack for random hackers. At least it is for me. It's so convenient to search for <any big OSS project> and find that someone is mirroring it on GitHub for convenience. It's simply faster to use their web interface to peruse through a project or to search within a project than it is to checkout a local copy and then open the directory in Sublime.
That having been said, I don't really consider "it's not on GitHub" to be a valid criticism. I certainly understand developers wanting to use their own solutions or that they might have hurt feelings after GitHub's handling of their intrusion (not that I care, just saying based on the number of HN posting, many people seem to)
