Better get a firewall for you monitor. Maybe a usb-c plug that filters non visual traffic? /s
A prepaid cellular modem is installed to transmit essential telemetry.
The idea of TVs doing this smells of urban legend to me, but a friend bought a new car recently, and he can connect to it from his phone (obviously over the cloud), he was wondering how it works because he didn't have to subscribe to anyhing, but yeah it has cellular connectivity paid for by the car manufacturer...