They get away with it because they don’t have serious competition and the reason for that is that allowing anyone to upload videos for free, to be viewed by anyone else for free, is by itself not a viable business model.

If you don’t know much about investing then you shouldn’t short anything ever. People who know about investing will tell you that even when your logic is 100 percent sound, the market isn’t that predictable and in general the market can stay irrational longer than you can stay solvent.