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Also, some TVs have been known to scan for open networks, and use those without permission.

Do you have a source on this?

There is none. This has been asserted for years on HN but I’ve never seen a modicum of evidence for it.

I posted it in this thread (I'm GP).

I admit, I think my source was probably HN comments. I tend to trust them more than they deserve.

I did a Google, and it seems a very sketchy claim.