Rule#3: Everybody runs a Raspberry PI G8BPQ node.

Back in the 80s and 90s, packet radio stations were broken up into sysops (system operators) and users. Sysops were the gods of packet because they were the people who owned the system. Users were fodder. They were what the sysops needed in order to be popular but users had no rights. Users were not read into the secrets of networking. It may even have been politically incorrect to ask how things were put together. Users had to stay out of the way when they were told to.
A caste system had been imposed.
This is a bad way to do radio. It may work on repeaters when everybody can hear what is going on and cooperation is required in order to operate. Packet radio has no such realities.
With our TARPN, we can eliminate the caste system. Everybody can take part in the benefits of being a system operator. Everybody can add to the system and critique its construction and operation. Everybody learns how to build/supervise/monitor/repair a network. Everybody can have a stake in the results.
Practically speaking, everybody will have a Raspberry PI network node. Everybody can support multiple links if they chose to. The good news is that the switch hardware is not very expensive and the work already done to prepare for the launch of our first TARPNs include making the management of the switch something everybody can do.
Rule = Everybody is an expandable network node because everybody has a Raspberry PI.

Note: This rule is less about a particular network app than it is about the requirement that all participants have the benefits and education that comes from having the same full network suite.