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by spookthesunset 2789 days ago
Some "smart TV"'s can phone home with TV usage data. I wouldn't be too surprised if there was a shazzam like thing in some smart TV's that can detect certain advertisements.

eg - https://www.cnet.com/how-to/disable-vizio-smart-tv-spying/

Once you match the public IP address of all your devices you can link up the identities and do fun advertising stuff.