Off the top of my head, Gamers Nexus is a counterpoint. Obviously not Mr Beast-scale, but we're also looking at a huge difference in target demographic breadth.
Besides, is YouTube any worse in this regard than what came before it? Substance-free reality TV predates YouTube. For as long as cheap printing and mail services have been around, artists have had strong incentive to go design ads rather than pursue their art independently.
YouTube definitely has a race to the bottom going on, but it's not all-consuming and well-researched, high-quality material is still profitable for creators as long as you know how to play the thumbnail game.
And I would say 99% of it is worse than the goofy YouTube stuff. Reality TV is mostly people hooking up and pretending to fall in love.
I extend the same criticisms towards traditional television as well.
They're both just symptoms of the advertising problem. Advertisers are the enablers of this stuff. They'll back any content that draws attention, and the ones which draw the most are memes, controversy, generally negative value slop. People endlessly scrolling apps with infinite content being fed instant gratification with product offerings in between. Algorithms that actively push them towards controversy and hate because it maximizes "engagement".