I think it's Sony that has a patent on a TV that uses a camera and microphone so they can play ads that only stop when you stand up, raise your arms and shout "McDonalds!", for example. Not in Black Mirror, in real life.
It's true, it's even possible they're sitting on it so nobody else can do it. But at the same time I feel like if they felt they could get away with it they'd do it. It's closer to reality than we'd like to think.
As in that's somewhat happening in an episode of the series where ads are being forced onto the main character, and it paused when the MC close his eye because he didn't want to watch it.