You mean nobody has routers set up so a few neighbors share the same service. I thought that was common.
Probably, but it is a violation of their service agreement with their internet provider. They are breaking the law and could be prosecuted (or sued in civil court) for theft of service. These are not victimless crimes — each person that gets service for free reduces the revenue of the provider, and requires the provider to raise prices for everybody else. It is direct theft from the company and indirect theft from all those other customers who are not cheating.