@siderea@isagalaev@jwz This makes me think of YouTube comments where the video author has total control to delete all criticism.
While this is great for moderation when dealing with harassment it is not so great when dealing with scammers or conspiracy theorists posting who have actively bad intentions.
With this level of control you could offer questionable ideas or promote harmful prospects without peer-review or expressed skepticism in the replies.
This would work with a very pro-active server moderation team like say, many small Mastodon servers, but not so good in a more relaxed larger public forum.
It has pros and cons to be aware of. Thank you for the thought experiment, this bears careful considering.