Most of the big names sell displays designed for commercial use (e.g. the screens you see at entrances to shopping centers), which are basically just big monitors, so no smart stuff, other than maybe being able to turn it on/off remotely. However instead of a $800 TV you are probably talking $5000 - not that the tech is much different, it's just that it's designed for commercial use. Is not seeing ads worth that much more for you?
A nice TV is a sizeable appliance that should live for 10-20 years. If I couldn't buy a fridge or microwave that didn't show ads on its smart display, I'd also be happy to pay a big premium for a commercial model.
I probably shouldn't give appliance companies ideas, but I'd give even odds that we'll be having that conversation within 10 years anyways.
Then I read stuff like this. Can I still buy a dumb TV? I'll pay more. Who sells them still? Or, like, can I open this thing up and take out the wifi antenna or something? I'd block it at the router, but I hear they also try and connect to open APs. Awful trend.