Wow this is really cyberpunk.
I'll bring my Yubikey!
I'd also like to see an "Order of the White Lotus" community (or Fight Club if you prefer) where people who collectively agree to not use AI against each other can come together. They can still use AI (i.e. out of necessity) just not with other members knowingly.
I suspect whatever form it takes the stakes will be very high to hack yourself into and pollute the space. So the more successful the community becomes, the harder it is to keep in order.
I do like your idea, though.
Local groups have a problem where members admit their friends or pressure others into inviting their friends who are not a net positive, but it feels too impolite to refuse or to kick someone out. Meeting someone in person also develops a sense of a social bond that makes it harder to downvote or flag their posts.
Local groups have always been a haven for affinity fraud, too. Running a scam is easier when you can smile, be charismatic, and pretend to be a personal friend before springing your ask on to your victims.
[0] https://handmadecities.com/memos/HMC-Memo-004-Meetup-Hosts.p...
p.s. @patrickmay: jinx!