Earlier quoted context omitted.
It needs to be physically disconnected or on a network without Internet connection. The Mac address is the easiest to spoof. If it has any kind of radio like WiFi you need to de-solder it, as the data could be collected by a car driving by, or via your neighborers Wifi.
> as the data could be collected by a car driving by, or via your neighborers Wifi. What? How is it going to connect to your neighbours wifi? How is someone driving past going to connect to your TV? Is the TV going to set itself up as an access point? I'm completely behind not connecting random devices in my house to the internet but suggesting they are somehow trying to get data out by connecting to random networks…
We already see this with things like ultrasonic communication. A compromised (has sketchy app installed) phone could, for example, communicate with your television or computer speakers and mic via ultrasonic frequencies to determine what ads you have seen, or what digital streaming content you are consuming.
An app could take it even a step further and use a root exploit and secretly take a short recording every 10 minutes or so to relay to someone who wants to know what song or movie you were consuming.
This isn't just possible, things like this have already been found in the wild.
And you can bet your bottom dollar these snaky companies would keep their mouths shut under a NSL if it meant they could keep tracking you.
https://www.schneier.com/blog/archives/2015/11/ads_surreptit...