Considering the challenges they have keeping everything online and stable for the number of repositories they already host, I don't really want them to be the f

Considering the challenges they have keeping everything online and stable for the number of repositories they already host, I don't really want them to be the free private backup service for every developer in the world. Maybe they don't want to be either. They don't seem to have a customer acquisition problem -- what's the benefit to Github in doing what you ask?