Are clustered IPFS nodes really the same as a private IPFS swarm? The latter I understand to be a bunch of nodes that only talk to each other, that don't talk to any node outside of their group. E.g. standard clustered nodes auto-pin all their objects among themselves, but these objects are (can be?) available to nodes outside of the cluster too. A private (i.e. not public) network would in my view be the equivalent of an F2F swarm, i.e. sharing (but not necessarily auto-pinning) all objects among themselves, but definitely not connecting to any nodes outside of their "F2F" swarm. (?) But I'm not sure.