This resembles the idea used by the now-disgraced Spanish Fon wifi outfit. I was Fon's most widely read English language fan blogger at http://elfonblog.fondoo.net Share wifi at home, receive wifi from your community elsewhere, even abroad. Except that no money is demanded and there's no hungry octopus in the center that swipes the majority of the wealth, and maintains obstacles instead of adding real value to the system .
I would add at least one feature to this project. The wifi can be unencrypted. The routers should have onboard VPN servers so people using the hotspots can encrypt their wifi to protect from nearby eavesdropping. Another option would be to forward the client's VPN tunnel to another OWM router somewhere else. This obscures the user's location. There would be automatic choice of endpoint depending on load. Idle routers with no local clients would not go to waste. A vip option could be to choose where your VPN tunnel makes you appear. If you're a contributor to the project, you would be a vip who could also choose his own router as endpoint so he can access LAN and file shares. OWM would provide a custom VPN client that ensures that the user is not using a fake hotspot, and facilitate making the choice of where the VPN endpoint is. It would be fairly simple to build a darknet available to those using the VPN clients.
Or, the wifi could be WPA encrypted... Whisher.com (now defunct and bought by wifi.com for no purpose) was working on a replacement/enhancement to the wifi manager on your windows, mac and linux pcs. It worked just like the regular one, but it also held an encrypted database of wifi router mac addresses and WPA keys for them. It indicated when you were in range of one, and would connect you to the router with full WPA encryption - without revealing the key to you (optimally). The owner of the hotspot could open his router to all, all but those on his blacklist, or only his friends on his whitelist. Privileges could be added or revoked on the fly. You could use any router with Whisher, as the router didn't require custom firmware, your pc used a custom wifi mgr. So, the Whisher app acted like DRM. It also supported a darknet sort of community and chat app, but I would say it was superfluous. The custom OWM client I describe above would do what Whisher did, though Whisher did not have any anonymization features. The OWM routers could still tunnel encrypted traffic to other endpoints.
WPA is more secure in one sense, but the key database could someday be cracked. Perfect Forward Secrecy type VPN encryption (if it exists) would be more work to crack, but also a higher load on the routers. Perhaps if a trustworthy VPN company was partnered with OWM so the endpoints could be independent of the embedded router systems. Faster speeds and more choices would be available with a paid subscription (but you could use any VPN provider).