I find that hard to believe. They're one of the most popular and successful companies in the Ruby community and they have paid accounts that they've been collecting on for quite some time now. EY has thousands of customers who pay them every month and can afford it. How would it be that one of their most popular customers who doesn't pay anything for hosting wouldn't be able to pay them for once?
EY is super expensive. Also most of the cost is for support techs who can read/understand ruby code and gems. Chances are the github guys don't really need that.
Indeed, I am not Scott Shacon. Too many Scott's! One time in undergrad three of us sat in a column and confused the hell out of our compiler's professor.