Scientists in Germany have demonstrated a startling new form of surveillance: identifying people using nothing more than ordinary WiFi signals. By analyzing how radio waves bounce around a room, researchers can effectively “see” and recognize individuals — even if they are not carrying a device and even if their phone is turned off.
My understanding is that this catches disruptions between devices and router. I don’t think this would work. I would say you should instead sell a “bracelet” with “ancient Himalayan Salt” embedded into the silicone to absorb and cancel the tracking. It would probably sell a ton! Obviously wouldn’t work but $!