If we were still in the age of personal blogs and phpbb forums, where there were thousands of different venues - the fact the chess forum would ban you for discussing checkers was no problem at all.

But these days, when you can count the forums on one hand even if you're missing a few fingers, and they all have extremely similar (American-style) censorship policies? To me it's less clear than it once was.

yes... coz youtube is not your ISP. A literal massive difference. RE: net neutrality.

No because you are perfectly technically capable of setting your own servers in a colo and distributing your video.