Unironically one of the greatest people in the technology space of the last 40 years, in the sense of accomplishments and impact on the world. I'm talking specifically about the free software movement, copyleft, and the GNU GPL. The world would be a much worse place without those accomplishments. The fact that a lot of his life's work is erroneously attributed to the kernel guy doesn't change that.

As a thinker, absolutely brilliant and unfortunately misunderstood. He espouses radical ideas about the relation of users to the technology they use that are still relevant to issues of today (e.g. enshittification, planned obsolescence, surveillance capitalism, and so on). It goes far beyond "you can look at source code to see if there's bugs or spyware in it." There's a reason "Stallman was right" is a meme.

As a leader and a figurehead I'm not convinced he's as effective. Regardless of the coordinated smear campaign from a few years ago (in which it was erroneously said "he defended Jeffrey Epstein" or "he blamed Epstein's victim" or some such), he has demonstrated behaviors that alienate people and people who have worked for/with him (e.g. FSF employees and GNU maintainers) have said he is not a good boss. His comment about "voluntary pedophilia" is inexcusable, even though he has said he no longer stands by it. The Epstein association was fabricated from a quote taken out of context, but I don't think it was wise to even join that discussion. The glibc manual abort() joke incident from 2018 is probably what convinced me of this - not so much that the joke is bad (humor is subjective) but that multiple developers objected to it and said it made them uncomfortable, yet he "pulled rank" and insisted it be left in (although as of now it seems to be absent). I believe his intentions were good (the "joke" isn't actually about abortion as such, but rather the US government "global gag rule" suppressing discussions of such) but forcing it in against the protests of the community was inappropriate in my opinion.

Overall despite the above I feel he's done more good than harm to the world, however, I'm not sure how much more good he can do in his position. I feel like the term "Stallmanism" would be an apt term for his thought but because of the above I feel leery associating myself with the guy.