No, because that puts the effort of fighting bad actors on everyone. It means that every day you have new trolls spewing hate in your comments, and that your users have to constantly keep blocking trolls who follow them (and who recruit other trolls to join them) until they get tired and leave the platform.

This isn't an academic debate, we've been seeing this play out online for at least 30 years. Probably longer - I wasn't around for Usenet's heyday but it wasn't immune either.

I feel like a simple reverse-recommendation algorithm could fulfill the role of auto blocking content.

“It looks like you hated that Nickleback song! You’ll probably also hate this Chad Kroeger solo project!”

You would see comments from random trolls under a whitelist model. You would only see stuff from your friends.