Oddbean new post about login | logout I think that was the so Sphinx chat model. You give up sats to join a group and send messages and if the chat room owner decided it was spam they could keep the sats.
Then you'd trust the good intentions of the host.
yeah, but it is an opt-in model and these things can be handled on the social layer through reputation. Additionally, we are not talking about huge sums. A deposit of 5$ per user would already kill almost all spammers, the individual loss in a rug is low.