As article says, I wouldn't want hundreds of them. Imagine uploading a simple website, only to have your issue tracker harassed by JSLint bots, HTML validators and pull requests correcting your indentation, replacing <b>s with <em>s etc.
It would also make GitHub a much more intimidating place to submit code. I don't want those things for my smaller projects.
https://github.com/github/github-services/tree/master/servic...