Yes. Cox has been doing it for years. They boast citywide hotspot access for all subscribers. I formerly thought that this hotspot network consisted of dedicated APs which they mount and maintain on utility poles in public places. But that’s just the start.

Every Cox customer has a Panoramic WiFi router that advertises as a member of the “CoxWiFi” SSID, and other customers can authenticate there and access the Internet through your connection. This is on a strictly opt-out basis.

I’ve opted-out, and also my router is permanently in Bridge Mode, so there is no technical way for me to provide anyone a WiFi connection. But all my neighbors do, even if they are blissfully unaware.