Intuitively, this seems like a simple result of over screening because kids don’t behave like devices.
Every time I go to a family restaurant, I see a tiny kid (frequently too young to even speak) sitting with a phone or iPad watching and maybe swiping away. And usually I experience a tantrum when that kid has to break away from their screen to do something in the real world.
If young kids spend more time with youtube than friends, that’s going to result in lots of stuff.
Fun fact, if you ever bring up how screens are bad for little kids you will fight with parents.