YouTube is amazing repository of millions of practical skills and knowledge. It's achievement at least on par with Wikipedia. Calling it a mistake just because there's some entertainment there as well that not everybody is fond of is a bit harsh.
Wikipedia sells information (in the form of "Donate or this could all go away") and is financially incentivized to make that information comprehensive and high quality. YouTube sells influence, and it is precisely that practice I object to.
Think about the videos on your homepage, in your recommended videos, which publishers you hear from immediately and which disappeared. I can see it trying to manipulate me.
There are billions of videos on YouTube with millions getting added every day.
YouTube has to decide what to put in front of you.
I know many people who spend 10 hours+ a day just listening to inflammatory content
It's also not just the consumers. So many great educational channels have been forced to appeal to click bait or lower quality content because of the nature of the platform