The challenge is that top youtubers do this for a living, it's how they put food on the table, and peertube has no monetization and also no path towards ever having monetization. Unlike other forms of social media with federated alternatives, videos are high cost/effort to host and produce. Its not like mastodon or lemmy where its mostly just text that people throw out into the void for their own entertainment and to socialize with other people.
There are ways you could maybe implement some form of monetization that architecturally respects creators and viewers more, but I'm pretty confident they're not things peertube as a project would ever implement.
As it stands, it would be kinda like asking professionals to donate their work for free on an ongoing basis.
Unfortunately it feels like peertube is unlikely to ever really offer the same thing YouTube is, in contrast to other fediverse projects that offer a similar experience to their counterparts just at a smaller scale. But producing much of the content people enjoy on YouTube is a career, and peertube can't really be that without monetization :/