I've been using https://news.ycombinator.com/active a lot more the last year, because so many important discussions (related to tech, but including politics or prominent figures like Musk) gets pushed out from the front page quickly. I don't think it's moderators doing it, but mass-flagging by users, (or perhaps some automagic if the discussion is too intense like num comments or downvotes). Of course, it might be the will of the community to flag these, but it does feel a bit abused in the way certain topics gets killed quickly.