By what yardstick? The Free Software movement is known by people in the software industry the world over. Stallman and the movement are hugely popular in the developing world... he's a pretty big deal in India, for example.
Thing is, he doesn't do the PR thing. The guy is honest with himself and with the world. I respect and admire that.
"Here's to the Crazy Ones. The misfits. The rebels. The trouble-makers. The round pegs in the square holes. The ones who see things differently. They're not fond of rules, and they have no respect for the status-quo. You can quote them, disagree with them, glorify, or vilify them. About the only thing you can't do is ignore them. Because they change things. They push the human race forward. And while some may see them as the crazy ones, we see genius. Because the people who are crazy enough to think they can change the world - are the ones who DO!"