I have a “smart” TV with a network cable plugged into nothing at all, with no wifi connected, plugged into an Oooold Lenovo Tiny PC running Mint. The Mint box does all my smarts. Pihole, ad-block, all that jazz. It never occurred to me that it might have connected to some open wifi out there, but none of my neighbors have guest wifi or anything, so hopefully I’m good. It’s definitely not on my wifi, anyways.