If people hosted video elsewhere, I would gladly never visit youtube again.
Creators are not going to start paying for uploads when they can push their costs to the viewers.
If I "blamed" the creators, you'd be telling me it's not their fault, they're just incentivised by the system, they're just playing the game.
But when I "blame" the system, you're telling me the system is not at fault, that it's individual choice to choose a near-monopoly on video discoverability that is propelled by and heavily benefiting from the same company's actual monopoly of search.
Is it "YT's problem?"? No, it's to YT's massive benefit, it's my problem when I have to suffer through adverts.
Not that this was part of the suit, but the whole practice of giving things away for free and subsidizing them with stalking and ads obviously distorts or completely destroys markets, so yes they can be blamed for doing that. The behavior of these companies is so bad that people in a recent thread were claiming things like chat services (where a single computer can provide service for millions of users) cannot be sustainably run by charging money.