There is only one protocol, for file transfer. Consequences: * There is no live user tracking. * Access control can be user/password or ssh keys * You alway

There is only one protocol, for file transfer. Consequences: * There is no live user tracking. * Access control can be user/password or ssh keys * You always have an archive of what you read * You always have an archive of chats * Everything is in principle decentralized (whether it is in practice depends on whether people keep files. * Clients are in control.