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On reddit, several defunct formerly NSFW "pussy" subreddits (e.g. /r/wetpussy) have been repurposed to contain pictures of cats instead.

Apparently some reddit user has made it a mission to grab them whenever they crop up.

/r/marijuanaenthusiasts/ is my personal favorite (its a tree related subreddit, since /r/trees was already taken)

Yeah, iirc, r/stormfront was immediately snatched up as a storm watching sub for similar reasons