"But my free speech!"

"Won't they just polarize even harder?"

"Won't they just operate in the ShAdOwS?"

Except that didn't happen. The people left for Voat, and then Voat died. Banning harmful communities works time-and-time again, and it would work for YouTube if they actually did anything. For every 'guideline update' or press release they do about content moderation, they do basically nothing. The one exception was the sketchy videos with children, but their solution has been pretty heavy-handed and reactionary. I think that's the problem: YouTube has never been pro-active in moderating its platform and it shows.