Yes, I'm definitely talking about databases with close memberships, but keep in mind that some seemingly "open membership" apps can still be implemented, some s

Yes, I'm definitely talking about databases with close memberships, but keep in mind that some seemingly "open membership" apps can still be implemented, some social networks come to mind, like chat apps, where each chat is a database, and all its participants are the agents. Maybe more sophisticated social networks like twitter could be implemented too, something like each post may be a database with it's own permissions and encrypted to for a group of accounts