But you still mentioned Peter McKinnon, not as as a good photographer, but as a good Youtube photographer which contradicts your point.
Also, there's YouTube is the way people learn a skill for free. Not everyone can take a classes. I started photography seriously seven years ago and learn the basics through youtube. When I wanted to take portraits outside, I went to youtube; when I wanted to understand time lapse, youtube. Yes, there will always be beginners that fall into the traps of "Gotta get that sweet bokeh *kiss* goodness" but they're still learning the basics.
You think YouTube is ruining new photographers, good for you, but your experience isn't universal and the fact you say that while also praising Peter McKinnon, the BIGGEST and most overhyped photographer on the platform just shows it's your opinion. If someone wants to learn photography, I'll be quick to point out a few youtube videos that illustrate lighting and composition.
As someone that does media for various branches, it's happens painfully often.
When I was with a library system, the head of the comms team downloaded a persons cooking video from youtube, edited out every instance of the channels logo on the bottom and clips of the persons face then uploaded it like "To celebrate this event, here's our recipe for this dish". They didn't see anything wrong with what they did. For Behavioral Health, they sent me a watermarked photo they liked and asked if I could just remove the watermark and use it for fliers.
Only person that ever double checked if we had a license for an image was up in admin. Everyone else had this surreal idea that if something was online, it was free to use.