Entertainers go where the audiences are, educators go where the students are, high production quality professionals who spend hundreds of manhours crafting a video go where the money is.

Any alternative to youtube will necessarily miss out on all the high quality video essays, and maybe all the in-it-for-the-money gaming channels/“reality” shows/mr beast clones/overproduced vlogs… but they will have random users uploading without feeling pressured to make it “quality” according to some algorithm or even the tastes of the majority