The YouTube watch history of any 13-year-old provides a handy counterexample to your assertion.
Slightly less flippantly, the days when the nation gathered around their TVs to all watch "Leave It To Beaver" at 8pm are long gone, the media landscape has been fragmenting for decades and this is just the next step. My kids don't watch TV shows, they follow YouTubers.
A six-year-old filmmaker has as much claim to copyright protection as Spielberg and Tarantino. Just because one uploads to YouTube and one is paid millions of dollars by a major movie studio, it doesn't mean that they're different in the eyes of the law.
From what I understand, once a work is created, copyright is assigned to that work's creator. That creator may then license that work however they want. Quality doesn't factor in.
Slightly less flippantly, the days when the nation gathered around their TVs to all watch "Leave It To Beaver" at 8pm are long gone, the media landscape has been fragmenting for decades and this is just the next step. My kids don't watch TV shows, they follow YouTubers.