To me, the critical factor is almost certainly money. Folks who got into this, to get paid, and are merely fronting a political position, quickly learn that the money isn't in teaching good left wing theory and praxis; it's in telling disaffected reactionary Americans that they're already perfect leftists and its the people who want them to surrender their reaction that are wrong/the CIA/fake left. Part of why I really stopped soliciting for money in 2019. Won't ever be me.