Years ago, I would keep YouTube playing constantly while I was at work and caught a handful of Prager u videos randomly, and this was well before I was the radical leftist I am now, they still rubbed me the wrong way. They did a great job making an argument that was fundamentally wrong but they'd always fail to explain an important mechanism for something critical. I can't think of any specific examples, I haven't actually watched one of their videos since I left that job. But it was always a huge leap that they disguised as a given fact. They're also just straight up lie about historical facts.