Some of those channels have videos complaining quite loudly about youtube, some are tech channels that do talk about the fediverse sometimes, some aren’t even aware of the fediverse but might be interested.
It might be worth drafting a message that explains that it won’t cost them anything to just sign up to an instance mirror their videos to peertube as a first step. For more technical channels, they can setup their own peertube instance and mirror there - together or alone.
There might be more incentives, but that’s for the community to discuss. What do you think?
I’m just a lurker in these things, but it seems to me that what you need is a way to find YouTubers who don’t want to be paid, who think their message is important and who don’t rely on video revenue. Who seek new communities to grow their audience.
Religion of all types fit this bill. Especially the aggressive sects of Christianity, Islam and Hindu . Especially the nationalist sects