It's been known for years that security agencies can use smart TVs as surveillance devices. Are they using remote activation technology on the average citizen? Doubtful, but that doesn't mean it won't or hasn't happened. Verizon got caught monitoring it's customers and selling the data. Samsung got caught spying on their customers and had to release this statement - "Please be aware that if your spoken words include personal or other sensitive information, that information will be among the data captured and transmitted to a third party."
Most of us shrug this stuff off as unimportant but it's good to be aware of these things, even on a surface level