Earlier quoted context omitted.
He doesnt seem to be liked by some of the more powerful, corporate entities in tech, probably because he pushes some agendas that are somewhat anti-their-profits. I think this was behind the rather unsuccessful attempts to cancel him a few years ago, which cast a shadow over his reputation.
I heard Stallman speak once about FOSS. He struck me as a very interesting person, but not very flexible in his views. Even if he's 100% "right" in the long run about how digital products should be completely free, his views are so polarizing that it'd be hard to interact with him long enough to understand his positions.
That said, I almost always use BSD or MIT licenses for my personal stuff; sometimes I use the Eclipse one because that's the default that Leiningen gives me for Clojure and I can't really be bothered.