I use GitHub for all of my projects, and for interaction with my clients, and I'm sure many other freelance developers are the same. While some of the projects I work on are set as public (I'll admit I don't usually bother putting any sort of license out there for those projects â" maybe if I wrote something useful I would) most of my projects contain client confidential info and are private. I suspect this is the same for many others.
I don't think this is some sort of slap in the face for Mr Stallman, but that, for most of us, we are just doing our jobs, and GitHub is an amazing tool enabling us to do them. Most developers don't think about Mr Stallman at all.