And why would they? Is this because they are (legally) obliged to filter content? If this is an actual problem then I suppose one way to deal with it is to eith

And why would they? Is this because they are (legally) obliged to filter content? If this is an actual problem then I suppose one way to deal with it is to either hire more staff or restrain the number of videos users can upload -- except the first one doesn't scale and the second one will not be popular with YouTube users. And given that Google is all about doing everything they do at a massive scale, neither of the two suggestions fit their weltanschauung.