If you watch the videos that only provide entertainment, you're creating demand for more of that content. If you go out of your way to find and watch videos that provide more than entertainment, you'll get more of those instead. And yes, they do exist. For example, I've been working my way through the videos of Cutting Edge Engineering Australia, which is fantastic content if you're at all into machinery or fabrication.

On a side rant, this is the same question that comes up with respect to Hollywood and pisses me off. "Why are most films now derivate, SFX-heavy garbage?" Answer: because people keep rewarding those movies with their dollars.