The main thing here is that twitter and Reddit dont pay their popular users (massively followed accounts i mean), but YouTube does. As long as PeerTube won’t have a business model, and they never will because that’s not what it was created for, i dont think there will be any migration
I use smartTube ony my TV (with sponsorblock integrated), LibreTube and newPipe on my phone (no ads, and download included), and YouTube + adguard, sponsorblock, unhook, dislike button extensions on my Desktoo. With all that effort, i do not need paying for Youtube premium.