Earlier quoted context omitted.
Not even a secret. A TV manufacturer publicly said a while ago that a TV without "smart" features is more expensive for the company (even if sold at the same retail price) because they cannot make any money from selling usage data.
It was the Vizio CTO, while trying to spin it positively it came out a bit too honest. https://www.techdirt.com/articles/20190114/08084341384/vizio...
Or maybe at high volume it becomes negligible anyway.