There may have been a relative increase in the numbers of creators on YT after monetization was introduced, but it wasn't on a scale that one person could perceive. Even before monetization, there was more content, of every type and subject, than one person could possibly ever watch. Videos starting to look slick and professional was the most visible result, but I don't feel that this corresponded to an increase in quality. Professional Youtubers post constantly, even when they have nothing to say, to stay visible. Because Peertube's space and bandwidth are paid for by server owners, who are mostly average individuals, I think it would be bad for them to attract that type of creator.