Mostly talking about stuff like breadtubers, chapo, and media personalities like that, I can kind of tell why people like Bernie and Jezza where they're at. Is it the added wealth being a popular media personality gives you, the need to give a consistent product, the need to appeal to a wide breadth of people, and so on?
edit: also props to Brett at RevLeft for continuing to radicalise himself as the show has gone on
A lib is more likely to get into a vaguely leftist or radlib talking head than a full-blown ML or something. Conversely, as most people are libs, those people get the largest audiences. Once they have a large enough audience, they would risk a lot of material well-being by changing their views. But people who get into those talking heads do so because of a contradiction they can not completely solve, and the audiences move past them to their left.