Of course.

Well, you're wrong. YouTube started with manual curation by their team.

https://lsvp.com/for-social-software-user-culture-is-as-important-as-product-features/

By watching what behavior they see, users learn how to use the product.

When this works well, you get fantastic, coherent experiences and terrific content. Pinterest, Instagram, Whisper are all examples. With Pinterest, early users saw aspirational clothing, furniture, accessories pinned, and so that is what they pinned too. With Instragram they saw beautiful photos and so that is what they posted. With Whisper they saw raw, honest confessionals and that is what they shared also.

When this works badly, you get ChatRoulette, Youtube comments, and Secret. Seeing others exposing themselves drives mean-time-to-penis to zero. Reading racist, hateful, semi-literate commentary makes it OK to respond with more flames and trolling. Scrolling through anonymous character assassination or bullying give users leave to do the same.

[...]

In each case, curation and moderation from the beginning was crucial to setting user culture from the beginning.