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Many of the cheap TVs with Roku built in require you to set up a Roku account before you can even use the HDMI inputs. After setting up your account you can disconnect it from the internet and use it as a normal TV, but I spent a while trying to get around this block. In the end I had to create a Roku account.
That sounds awful; hopefully you were at least able to poison their DB with a fake name and a 10minutemail (or similar) account?
Basically, though I tend to use GMX email aliases for these sorts of useless signups. I don’t want some temporary email account to be all that’s needed to get control over my TV should I ever connect it to the internet again.