Every person who carries a WiFi enabled device with them can be tracked. The people they’re with can be tracked. Even if you have the WiFi on your device turned off, the device will occasionally turn it back on to “look around”.
The future of WiFi is Mesh, and Google might be missing out
While I’m excited about Google WiFi and will probably deploy it at my home, there’s a lot of unnecessary overlap, and a lot lost potential Google could leverage using products that are already in people’s homes.