I don't watch children's videos, so I'll leave that factor aside. All your citations are to opinion pieces written by people with an agenda to push, i.e. not fact, not by a long shot. I watch YouTube for education and entertainment. The loss of all the educational content, by itself, would be a massive loss to humanity. If YouTube were to go down, some educators will re-upload their content to other places. Moreover, radical activists would be the among the first to adopt YouTube's replacements, thereby solving nothing.
> No one is responsible for content, and look what that’s gotten us.
I suspect your views are coloured by the kind of things you watch. YouTube's algorithms have adapted to your viewing profile. Most of my recommendations are for science, math, and music pedagogy. From where I stand, YouTube has gotten us to a great place.