Details https://mashable.com/article/amazon-sidewalk-surveillance-ne... If you have certain Ring cameras or Echo devices, Amazon enabled a new radio in it back in September. You can opt out from the Alexa app: More -> Settings -> Account Settings -> Amazon Sidewalk -> Off.
Though at least if they did this, it's not using my network/affecting my data limits/able to be used by a hacker to exploit my network. Plus there would probably be a physical cell antenna somewhere that could be... altered.
I never connect it via WiFi so it never has my password and use an Apple TV for streaming services. If I need to update the firmware, I use ethernet and then disconnect when done.
>And inevitably someone will say that they'd heard that Smart TVs will connect to unsecured WiFi networks in proximity and start uploading your data.
That's bullshit because that could get into a HIGHLY illegal issue on the manufacturer as they could join into a foreign network tampering with comms. And IDK on the US, but the fines on Europe on that are really high.