Everyone has a WiFi router in their home. Webcams give you great data in a particular frame, but laptops aren't always open, they move around, they only look in

Everyone has a WiFi router in their home. Webcams give you great data in a particular frame, but laptops aren't always open, they move around, they only look in one direction at a time. WiFi routers just look like passive boxes. Heck, in an unfamiliar house you might have to go on an expedition to even find the thing, and a router shoved behind a cabinet can track you too.