Those content restrictions aren’t because youtube itself has any moral objections, it’s a combination of what the law allows (see COPA related fines changing content rules) and what (most) big budget advertisers are willing to appear beside.

The previous "adpocalypse"s have shaped a large portion of youtube’s content policies.

 

Any other platform hoping to take market share from youtube will have to deal with the same pressures if they expect to pay their bills once the VC money runs out.