What do you NOT want to see replicated on kbin?

Or the fediverse in general.

I wanted to ask everyone their personal least favorite communities on reddit.

Whic subreddits do you absolutely not (personally of course) want to see recreated as magazines here on kbin, or as fediverse communities in general?

My pet peeve is CMV. I always felt while the idea seemed doable on the surface, the implementation within that particular subreddit with the delta system, the requirement for the top level comments to oppose the OP even if the "view" is an established expert consensus on something like climate change made it impossible to have meaningful conversations.

I haven't checked if we have a CMV magazine here, but as soon as I see one, I know I'm blocking it.

What is your "instant block" community?