As far as I know it uses the B.A.T.M.A.N. mesh protocol. On a channel within the regular 2.4GHz wifi spectrum. So no license needed unless it collides with laws for point-to-point beams. All people communicating to each other obviously need to agree on a channel. It comes with some hierarchy where I'm at. There are local chapters who make up some config and who also operate nodes and exit nodes into the internet. These are necessary because Germany has stupid laws.