Funnily enough, PewDiePie is no longer on YouTube's good-side, and virtually all of his newly uploaded videos get demonetized by YouTube. He's no longer "advertiser-friendly"
From YouTube's point of view, that's bad, so they need a replacement. It's quantity of views they need, they don't actually have a stake in the success of any one creator.
I remember the headlines, but had to go to wikipedia to see why they abandoned ship.