I think Tildes is pretty good, but their subreddit-equivalent policy is bizarre—only admins can make them, and they will only make them if they see demand. This

I think Tildes is pretty good, but their subreddit-equivalent policy is bizarre—only admins can make them, and they will only make them if they see demand. This is a chicken-and-egg problem that will prevent many niche topics from finding a community, the way they did on Reddit. I hope it's just marketing talk covering a technical limitation instead of a genuinely permanent flaw.