Currently private users and enthusiasts. As networks grow, there will probably be universities joining. Eventually corporations will start marketing plug and play equipment while selling access to server space and long distance connections. Other businesses will join and finance their services by selling subscriptions, advertising, and user data. Various government agencies will add hardware they can also use to track traffic. Someone will inevitably bring in bots, AI models, and internet connected devices. After that someone will coin the term “dead mesh network theory” and all the nerdlings will start developing the next knitted network or something.