1. yes I think so
  2. yes
  3. I think to create a sub there might be an upfront cost or like 10,000 sats.
re 3) 10k sats Not terrible- at the current sats/USD, it's similar to price of buying a domain for a year, which might be enough of a deterrent.
I wonder if maybe it could be something the community votes on for approval to avoid the potential spamming. Haven't been on indiehackers for a while but I think their subforum/groups functionality, after you apply and you need a certain number of people to express interest in joining before it becomes a real group.
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