Xfinity runs an open WiFi for its customers. If you instead their gateway and don’t change anything (which is 99% of users) any Xfinity customer can get online. Several of my neighbors have them, and you can’t walk around in my commercial district without seeing the “Xfinity WiFi” SSID. It would be smart for TV mfrs to do a deal with Xfinity and their equivalents world wide in order to sell viewer data to advertisers and receive “fresh” ads, even if the TVs are excluded from the residential network.