Even having three security cameras around the perimeter of your house can allow quite precise location and activity detection inside the house via their audio steams.
I don't have security cameras in my house but that's actually interesting to see how things most people have in their house can (and does?) used to spy on them.
If I ever try to hide (which is probably impossible at this time and age), I will probably just break my phone not like I can use it anyways every single act in it sends data to too many places to count.
π RuView turns commodity WiFi signals into real-time spatial intelligence, vital sign monitoring, and presence detection — all without a single pixel of video.