Stallman deserves a real doctorate no doubt about that. He shouldn't be seen as the same as someone who happened to donate enough or be famous enough, he's done so much more. He shouldn't pretend he has an honour he hasn't earned either, that's just sad.
This gets back to the OP's original point, the need for a differentiation between PhDs between "My accomplishment is name recognition" and "I have done the work, I just didn't fill out out an application form first".
I'm guessing that if Stallman were to approach most universities, and say that he wants to turn his life's work into a PhD dissertation, they would welcome him with open arms. Within months, at most, he would have the PhD.
He has decided not to do this. Thus, he shouldn't claim the title.
