Mr. Wilder builds communications systems based around Freedom Towers, DIY kits that fit in a suitcase containing everything one would need to set up an ad hoc peer to peer network. The instructions are simple: “Plug it in. Press the big green button.” It creates a local network that stays up no matter what happens to the wider global Internet. All of this is mostly funded through private donations from family, friends, and fellow revolutionaries. Mr. Wilder estimates that the equipment required to assemble a Freedom Tower would have cost over $10,000 as recent as five years ago. Today: $2,000. And it’s completely grid-independent. That means solar powered batteries, a DC power system, a server, a router and a suite of powerful software, all contained in a suitcase.