Impossible to find, I tried. Just use PiHole.

I have a Samsung TV (was not my choice), and it’s a hell for privacy, software is terrible.

Now it has no access to any network, all features that could be disabled are disabled. I use CCwGTV as an OS for my apps, but that could be any dongle or PC.

If you want a 100% safe option don’t connect the tv to the internet. Then use your own kodi box or alike.

if I was in the market I’d look at commercial signage displays first. explicitly digital signage because nothing is free from software anymore but signage needs to be plug and play.

Otherwise you’re looking at computer monitors.

Personally I have an old Sonique lcd from the analogue change over so it has a bunch of RCA, Component, Hdmi, a tosloink, an analogue tuner that doesn’t blue screen so I can watch static if I wanted to (or use a game console from before RCA without modding it) and a digital tuner. and the best part is it has a sleep button that just fucking works.

I do want to find a better option than chromecast but that’s a different story.

I just connected mine, did all the updates, then disconnected from wifi

Good enough for most I would think