In addition to what the other commenters have said: They don’t just sell light bulbs but also motion sensors that can even measure temperature.

So they wouldn’t just be able to tell which room you’re in at any given time but may also be able to tell when and for how long you shower or how often you cook food in the kitchen based on slight temperature changes.

And if you wanna get really paranoid: Hue Sync analyzes what’s on your screen and synchronizes lights accordingly. Who knows what is really going on there if they pull this kinda shit lol