But that it is efficient doesn't mean that it is not also crap. Suppose there is a community where people argue for X or Y. The moderators like X. 50 % of the u

But that it is efficient doesn't mean that it is not also crap. Suppose there is a community where people argue for X or Y. The moderators like X. 50 % of the users are assholes and 50 % are level-headed. The moderators shadow-ban all users who likes Y and who also level-headed. What you have left are the users who like X and assholes who like Y. Uninvolved people who visit the community have no idea the moderators are so underhanded so appears to them that everyone who likes Y is an asshole. Thereby giving them the impression that X is more likable. On Reddit tons of political subs moderated in that way. It's one of the reasons why there's multiple subs for Covid news. One for those who think more lock-down is needed and one for those do favor less lock-down.