Did your Roku TV decide to strong arm you into giving up your rights or lose your FULLY FUNCTIONING WORKING TV? Because mine did.
It doesn't matter if you only use it as a dumb panel for an Apple TV, Fire stick, or just to play your gaming console. You either agree or get bent.
That's scary. Only solution then is to buy smart and castrate it.
What I did. I have two smart TVs.
Fuckers have never once been online. You can even go the extra mile and open them up and unplug the wifi antenna (or just remove the wifi card if its slotted and not integrated into the mainboard)
I brought mine online long enough to do an initial firmware update. That was it. I may bring it online long enough to do another one, but I'm going to google first to be sure they haven't done something like Roku here without my having heard about it.
I wouldnt even do that unless there is an actual issue you are having that can only be fixed with a firmware update.