I don't expect they'll ban videos that are entirely ads, like re-posted TV commercials, and movie trailers. So I don't see why they'd ban videos that are part-a

I don't expect they'll ban videos that are entirely ads, like re-posted TV commercials, and movie trailers. So I don't see why they'd ban videos that are part-ad. It's not like streaming TV shows and ordinary Hollywood movies don't do the same thing, double-dipping by charging for the content then putting anything from subtle product placements to actual, embedded ads complete with dialog in them. Cable has ads (didn't, at first) even though you pay for it. Books often have ads in them, even though you buy them—old pulp books have outright glossy-print ads in the middle, sometimes, and it's entirely ordinary for a publisher to advertise other books they sell near the front or end of a book. YouTube videos containing ads even if you pay for the service just makes it the same as everydamnthing else.