YouTube still offers them a service in directing them new viewers. The big creators all lose viewers but YouTube funnels replacement views faster than they lose. They could host their own videos but they are gonna see very little growth without Google either in search or with YouTube as they start to lose the base that followed them.
They also won’t be able to negotiate as good as rates for pre-rolls or in video sponsorships as if they were on YouTube.
The only real alternative would be to band together like the creators that are a part of nebula are doing. Hosting on peertube really isn’t an option unless you are independently supported and you are doing it as a passion project and don’t care about audience growth or retention.
I mean 1.) the network is still pretty small and so the ratio of creators are gonna be low because the audience is low.
2.) the discussions here are still good and engaging. Unless you mean that everyone is a leftist and therefore the same. That’s not even true unless you only follow communities on Lemmy.ml and that’s only because their admins will remove comments for not being leftist