( See comments about said Samsung TVs ) - https://news.ycombinator.com/item?id=13581771
https://www.theguardian.com/technology/2015/feb/19/samsung-s...
Not sure if they were selling any of those data, anonymized or not, either.
edit: It's also worth pointing out that while technical people (e.g. us) may see voice recognition tech and immediately suspect that it involves phoning home, most people probably have no idea that anything of what they say is leaving their living room.
"Interest Based Advertisement. Samsung provides the ability to obtain and view interactive and interest based advertising on your Smart TV. Interest based advertisements will rely on your TV viewing history and Smart TV usage information. Your viewing history includes information about the networks, channels, and programs viewed on your Smart TV and the amount of time spent viewing them. We may use automatic content recognition (ACR) and other technologies to capture this information."
It is opt-out, and it's buried a couple levels deep in the menus.