I made the mistake of buying a Samsung TV a few years ago. I created this guide[0] which gained some traction.

Also, I'm pretty sure they do upload something recognisable because one time (2-3 years ago) I accidentally pressed the 'social' button on the remote while I was watching premier league football on Sky Sports (via a separate satellite box) and the TV started showing me relevant tweets about the match.

I'm definitely not buying a 'Smart TV' next time.

[0] https://gist.github.com/peteryates/b44b70d19ccd52f62d66cdd4b...