Tvs can themselves have their privacy improved by never connecting it to WIFI, except, maybe for software updates, if needed (rare).

The smarts you connect to the TV can vary.

Apple Ts manage things in some good ways.

NVidia Shields are good in others for Android TV.

The Android TV platform is likely more customizable (check youtube the past few weeks) to get it how you want.

Last, but not least, some poeple may just hook up a web browser to the TV and then contain that.