Yeah this is something I feel like doesn't get talked about enough. I have a raspberry PI that acts as my streaming device connected to my Samsung "Smart" TV and since Samsung can't get on the WIFI it's effectively just a display terminal.
Nah, it can still connect through the smart TV of the neighbours.
They probably have cross-brand agreements in place to let any "offline" device access advertisement networks. Your data is a very profitable business for them.