It fell victim to the very same phenomenon it is describing. Online user-generated-content moderation systems (whether upvoting/downvoting, Slashdot-style, etc

It fell victim to the very same phenomenon it is describing. Online user-generated-content moderation systems (whether upvoting/downvoting, Slashdot-style, etc.) are just a type of "fact-checking" in practice. When the ability/opportunity to act as a moderator within such a system depends on conforming with the community, then biases can become repeatedly amplified over time, and the results of such moderation become questionable to a sizable part of the population.