The replacement happened somewhere around time Ellen Pao became interim CEO and site started sanitizing the controversial subreddits. It wasn't apparent at the first but around 2017 you could notice that some subs - especially ones set around large companies or media franchises, are having aggressive rules against controversial and "negative" topics. This hasn't changed much as for today.

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One of subs I was visiting had some drama happening in ~2020 around supposed negative community behavior: people were criticizing creative works uploaded which personally I agree, weren't the best. Mods team decided that's a big no-no and this place has to be inclusive, welcoming and filled with positivity - so they started banning those who dared to criticize. Fast forward till now, there are only screenshots uploaded by bots, comments done by bots who also include screenshots along with 2 sentences in every thread.