That's what I thought we well, but TFA seems to suggest that some TVs may overlay ads on top of any video source:
"Vizio collected a selection of pixels on the screen and matched them to an existing database of content to find out what a user was watching and when"
"pop-ups would reportedly appear halfway through the show and be injected into the users' own content, such as home videos"
Cue the responses confidently dismissing the issue because there is some convoluted setup involving additional hardware and network configuration that any consumer can surely set up if they don't like what these products are doing.
If the plan is to get a TV (irrespective of it including "smart" features) and then use your own external dongle, then you'd have to be crazy to connect the TV to the internet. I think that must have been an implied instruction in the comment you replied to.
I got a very nice "smart" TV, plugged in my own inputs, and entirely ignored that the TV had its own apps. It works just as well as a "dumb" panel would have.
"Vizio collected a selection of pixels on the screen and matched them to an existing database of content to find out what a user was watching and when"
"pop-ups would reportedly appear halfway through the show and be injected into the users' own content, such as home videos"