Xfinity/Comcast does the same thing. By default, the router they provide has a separate WiFi network supporting their distributed WiFi service. It's only for their customers, and it's not an open no-password network, but I'm certain they would offer it to any company that paid for access. They also have WiFi APs on telephone poles to broaden coverage.

If you live in a dense city, there's a good chance you can reach an open network. When I lived in midtown Manhattan, there were around 500 SSIDs reachable from my apartment.