Youtube has great individual creators like 3blue1brown, but I'm skeptical that youtube itself will supply the additional human curation and editing role require

Youtube has great individual creators like 3blue1brown, but I'm skeptical that youtube itself will supply the additional human curation and editing role required to make an educational resource that is consistently coherent and useful across a range of topics (like say, khanacademy.org). I'm also curious what benefits youtube would provide a creator/educator like, say, musician Charles Cornell, who is already perfectly able to sell his course that he advertises in his youtube videos.