Network jail isn't a 100% for these -- in their testing, they determined that they could connect to the public Comcast networks that Comcast tries to blanket areas with. So even if you don't let it access your own networks, it will look for other ways to phone home.

Samsungs commercial grade signage displays have become quite smart and so have LGs.

I work in the refurb department of an ewaste recycling company. I had a TV on a roller stand come in some months ago. When I turned it on, I realized that it wasn't any ordinary consumer-grade TV, but a commercial grade one. It lacked any sort of smart functionality, had no apps, and reported DCI 4K resolution (4096x2160) when connected to a PC. I found a remote that worked with it (even though it was a 'smart' TV remote). I listed it as a "dumb TV" for $200 and it took a while to sell.

> Alternatively, you can get an Apple TV and keep the TV off networks or in network jail.

The problem is that a lot of TVs won't even let you use it that way without signing in or downloading an app first. My Vizio wouldn't do anything until I acknowledged a terms of service screen. The only way I could do that was by downloading the Vizio app and connecting it to my network.