It's really more about what they are directed too.
My son loves wildlife and has watched a ton on all kinds of amazing animals facts.
He will tell us stuff and my wife and I will be like there is no way that is true, google it and realize he is right. When we ask where he learned it he says YT.
All that said...he also knows a lot of swear words and stupid slang like Cap, that's sus and other things.