Does FOSS mandate that anything and everything must be open sourced? Richard Stallman holds this belief that all software should be free as in speech, but is such belief universally held? Or simply put, did MS violate any license at all?

And no, I didn't imply that FOSS supporters are freeloaders in any way. You got that impression probably because of loss in translation. Rather, people who criticize MS for not open sourcing a specific piece of software are moral crusaders, trying to force a company or anyone to totally comply with their moral standard.