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Malicious Compliance on Reddit in a nutshell
(feddit.de)
Source: comment thread in r/interestingasfuck stating that it has not become a 'porn sub'. It only for nsfw because they also do malicious compliance.
It temporarily boosts activity, but that's useless activity. It's not going to help Reddit in the long run, and in fact will diminish Reddit's value if it goes on long enough.