Depends on who you're buying from. In general, home/consumer usage is cheaper, less reliable, and comes with those restrictions compared to a business use.
Either fibre or wireless link(s) to an upstream provider. Non-residential connections don't have the same sort of ToS that residential broadband does.
The cost of those links (or link) is then shared by the community wireless organization. So typically, subscribers pay a small monthly fee to join the mesh, which covers the cost of Internet connectivity and any other shared resources in the community network (ie. rooftop space for a central node, etc).
