The idea is to be a space where existing social groups play, rather than a wider community - it's inherently based on a level of pre-existing trust. Writing about it is supposed to be an incentive for people to build their own little spaces where they can share weird stuff that should never be near the public internet - it's cool to have a network of thermal printers that people can submit jokes to, but it only really works if access is somewhat limited.

The SIP "redphones" is an idea I really like. My wife managed to get a SIP IP phone from one of her buy-nothing groups that I've been meaning to setup an Asterisk server for just to mess with. Maybe stick it upstairs where my kid likes to play & let him get the experience of using a "real" phone.