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Roku’s Ultimatum: Surrender Jury Trial Rights or Lose Access to Your TVs
(programming.dev)
This is a most excellent place for technology news and articles.
I have a Samsung S90, and I was able to disconnect from my network after the initial setup. I also set it to default to the last HDMI input at startup, so I never see the TV OS.
I feel like this is subject to change, but a smart TV without an Internet connection seems to still be an option until they take it away.