I think it's the "temporary" part of the licence where the trouble comes. Yes, you're allowed to do whatever you want privately...until you're not. I mean Louis Rossman is (in my view) a very trustworthy individual, so "trust me bro" legitimately does carry a lot of weight when he's involved on the project, but "we can take away your licence at any time for no reason at all" is not something seen in the open source world.