A Misc. sub would help on a few fronts:
  1. It would keep the other subs more focused
  2. You can see what else the SN community is interested in and more easily identify what new subs to add
  3. New users who like the concept of SN, but whose primary interests aren't bitcoin or nostr will have a better experience using the site.
Another idea, which might be better implemented as a new post type than sub, is Prediction Markets. We've been having fun predicting sports outcomes, but it's totally dependent on someone promising a bounty for the winner. Being able to stake sats to a pool that pays out to the winners would be very cool.