Just unplug it from the network. That should get rid of most of it. I have an LG smart TV that has never seen the network. I get no ads, no popups, no features, no EULA, nothing. It behaves like a dumb TV.
Please stop repeating this. Yes, it's in the spec, but can you find anything that actually implements it? Manufacturers can barely get HDMI CEC working, let alone Ethernet.
Yes, it does depend on the cable. Not all HDMI cables support it. I think it's cheap enough to add that many or most HDMI cables will support it in the future, if they do not already.
I've read about TVs that already did that. The owner purposefully didn't configure WiFi or Ethernet, and months later the TV suddenly prompted to install an update because it found a neighbour's open WiFi.
All you need is to glimpse 1 satellite for a short while if you're looking for a roughly accurate time.
You need 3 to get a position fix, but fewer will still give you the time.
It was the LG 65UH series from Costco.