Do you have any specific examples of devices where this has been implemented? Because I've heard this idea thrown around a lot as a hypothetical, but never any concrete evidence that it's been done.

https://www.theguardian.com/technology/2010/may/15/google-ad...

https://www.theguardian.com/technology/blog/2011/apr/25/goog...

https://theweek.com/tech/wifi-signals-now-tracking-users-at-...

https://www.youtube.com/watch?v=hlbjUvkoyBA

https://wigle.net/

And here's the opt-out steps to get Google to stop scanning your Wifi: https://support.google.com/maps/answer/1725632#how_opt_out&z...

Hypothetical is beside the point. The hardware is there, the software is closed and you can't verify what is really happening, so the potential threat exists.