Warning content may include language as I have Tourettes syndrome browse at your own peril however I believe that it is up to the parents to police their children on the content they view.
I also feel that children are going to find ways to get around every block you set against them just to show you they can. I did it you did it as a child and your kids will do it!
Setting limits on them just makes them seek whatever content they want to watch. Age restrictions should be put on YouTube by default. even if that’s done as I keep saying the smart ones will find a way to whatever.
And is that a bad thing? We are in a Renaissance of technology keeping back information stagnates the growth that humans have left. It is no longer survival of the fittest brawn but expansion of the mind.
Also lets face it some people are more advanced then others.
I look back to reading 20,000 leagues under the sea in first grade the thick unabridged version.
I look back to my young self taking on books like the Iliad and the Odyssey at a very young age. I say the only thing we ban is porn and let the parents sort their own kids out.