Is there a difference between a dumb tv and a smart tv that you leave on hdmi1 input ?
Smart TV have a absolute requirement of having an Ethernet port/WiFi in which to “optionally” do Internet with.
Keeping the Internet away from the TV and you should be entirely just fine and ad-free.
I've been asking myself that question for quite a while, now. It's got totalitarian states, theocracies, personality cults, total surveillance, random ostracism, flying killer robots, increasingly unstable weather, increasingly unstable economies, the return of the nuclear threat, bitter internal political divisions, and probably more.
An "all of the above" dystopia?
Currently smart TV's rely on home internet connectivity, but the current big fear is that they will start using things like Amazon Sidewalk or other 3rd party WiFi providers automatically, or even have manufacturers start embedding 4G LTE or 5G connectivity into the TV's itself so you can't isolate them without taking the thing apart and cutting out the antenna (and hoping there isn't a kill-switch if it can't call home).
This has been going on for a long time - part of the reason "dumb" monitors such as digital signage displays are so much more expensive than smart TV's is that they aren't subsidised by ads and telemetry.