I think we need to be careful with the language like “this is what the users want” when something along the lines of “this is what triggers of pattern of compulsive behavior in users” is closer to the truth
And I would say its mostly not YouTube actually producing the content. They are responsible for the "reward mechanism" of clickbaity/shock content driving views, and in return, more views meaning more money for the creators. But I would really like to hear of another model. If YouTube didn't do it, someone else assuredly will. And traditional media is/was barely any better.