None of my youtube creators are producing content on peer-tube.
That's probably more of a monetization issue than anything related to peertube. If your job is making Youtube videos, then at least some portion of your income is AdSense. Sure, it's not what it was, but at scale it's not nothing, and the peertube alternative is.... $0.
(Also, for the non-commercial ones or the ones that are funded outside of Youtube, maybe ask if they'll use Peertube. I've had luck with a couple of people I watched being willing to upload to multiple platforms, but you don't know if you don't ask.)