Many would could say same about open source software, people developing their own technology. They are doing their own thing, there is a lot of rubbish code (noise) to good open source code (signal). Maybe a large company like Microsoft or IBM take control of it and be the guardians of the code.
Youtube has everything from make up tutorials, instructions on how to do fix your laptop, cook a meal, there are people making their own reviews of retro computer hardware. Other people are releasing their own music, tutorials on how to code, teachers helping people with their maths homework. Almost all of this would never see the light of day on regular television. Yet somehow you have concentrated on the negative elements.
Claiming it doesn't scale because you don't like some of the content on there is ridiculous and you are just projecting your personal politics on everyone else. If you don't like the content you can just not watch it. I don't like watching network television because it is awful, I like seeing people debate and debunk things like conspiracy theories because it is fun.
I really wish people like yourself would just be honest and just come out to say that you think that certain people shouldn't be allowed to speak because you think you are better than them.