The only reason it's a SPOF is they don't allow anyone to read/run/modify their code... that's what open source covers.

I think the problem is we conflate selling the only access to our code with selling access to it. If you need online hosting for your project the alternatives are almost immutable - somebody's server running project management software.

No matter what Github does developers are trending towards using open source tools to the extent Microsoft's porting their company to Linux right in front of our faces...