Obvious in hindsight, but if you grew up from a little project to a big one, built so that your "users" are cloning your git repository, is it really clear that you've transitioned from "hosting source code" to "using it as a CDN" sometime along the way?
It's not like these guys thought, "Well, we really should use some dedicated high-end host for all our traffic, but we'll use GitHub because it's easier."
