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selver wrote (edited )

That's called a mesh network. They already exist, some on a very large scale. Folks in my city are experimenting with using antennas to send wifi from one apartment to another across the street (works for up to 200mb/s or something), so one person can pay for a good connection, and then share or sell it to others.

In Spain (I think that's where) the ISP companies were not running lines out to rural areas, so people starting creating a mesh network with long range receivers, and that's what's widely used now.

Edit: the thing in Spain is called Guifi.net