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.



They tend to be cheaper or have more features. The income from data harvesting subsidizes the price.
Plus, in a lot of places you can’t get dumb TVs without them being commercial displays, which have different priorities. Businesses don’t really care about having 60hz, HDR, OLED, or low latency. Sometimes they don’t even care about having 4K resolution.