I've seen so many forums where the pitch is that it's "like a subreddit or Hacker News but for X", where X is scientific papers, Go articles, OtherLang articles

I've seen so many forums where the pitch is that it's "like a subreddit or Hacker News but for X", where X is scientific papers, Go articles, OtherLang articles, etc.. and the only one that maintained at least some traffic is lobste.rs, all the others are ghost towns.