I’ll give this a try. I played around with a docker image, I got until having two test users (with docker commands…) that couldn’t find each other unless referred by the exact user name, same for “public” rooms that were not discoverable, I hope this will be more straightforward

Some years ago there was a fake ad on that, but even then I couldn’t decide if that was a joke or a market test

Criminal organization in the legal sense doesn’t imply some well known mafia they need to belong to, it’s enough that a relatively large group of people performed the act, which stands here, according to the cited article.