The link has a ton of information.
Now, It is obvious that putting it completely offline is more safe. But, some people often use the TV’s to watch Netflix or something like that. Then they might forget that it is still connected to the internet when they are done watching.
Under Privacy Settings, there are options for Device Usage Data, Collect App and Over-the-Air Usage, and Interest-Based Ads. All are enabled by default, but you can disable them.



The correct answer is VLAN/MAC jail or no connection.
Even DNS blocks won’t stop persistent tracking which often has fallback IPs.
Isolate it and only allow the domains you need.
Not the correct answer, because the defective products will start bugging you about lack of connectivity, and eventually can stop working.
“*” match solves lazy domain matching and smart TV OEMs would be getting lawsuited if they failed to function without an internet connection when HDMI input is provided.
It seems they are not getting sued enough.