There are still some dumb TVs manufacturers like SWEDX in the EU and Sceptre in the US. I don't have any of their products so I can't tell about their quality.

There are still some dumb TVs manufacturers like SWEDX in the EU and Sceptre in the US. I don't have any of their products so I can't tell about their quality. https://www.swedx.com/ https://www.swedx.com/ https://www.sceptre.com/ https://www.sceptre.com/ Also some Samsung models use Tizen as the OS, which hopefully could be more easier to jailbreak. Another option are signage displays, which usually (not always, though) are big dumb unconnected monitors. They're also a lot more robust (and pricey) than consumer TVs.