Regarding “smart TVs,” they come from the factory with ACR (automatic content recognition) which collects viewing information for more targeted ads.

Here’s how to opt out:
https://www.consumerreports.org/privacy/how-to-turn-off-smart-tv-snooping-features/

Here’s another similar article.

https://www.zdnet.com/article/how-to-keep-your-smart-tv-from-spying-on-you/

The best way to prevent this is to disable the smart TV features entirely - or don’t get a smart TV. Why pay extra to be part of some marketing scheme? And watch out for those streaming devices like Roku, Firestick, and Chromecast, because they do the same thing.

John R Carter Sr