The paper is fairly interesting from a methodological POV, and I do agree with the hypothesis that negative feedback actually does encourage trolls too, but none of those communities are anything close to reddit in their scope. The biggest problem I see in making the analogy is the fact that two of the four communities(allkpop, IGN) studied are fairly myopic in their subject focus, and subject to filter bubbles.
But so are subreddits, by definition. Why would a collection of independently myopic communities act differently? It might I suppose but it seems less likely.
