I remember on Reddit, during the height of astroturfing and such during the pandemic, people would post stupid shit and block anyone who called them out for spreading misinformation.

At first I thought it was just people who had stupid ideas and didn’t want to change their minds, until I started seeing some of them saying things like “You know I’m right, which is why you won’t reply to this”…and the original commenter would never see it.

It was an effective tool for people who wanted to try to control narratives or otherwise spread misinformation.