How to Turn Off Smart TV Snooping Features - Consumer Reports
www.consumerreports.org
TVs collect a huge amount of data. Here's how to use privacy settings to limit the surveillance on TVs from LG, Samsung, TCL, and every other big brand.

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.