Assistive technology is a good point! But we don't need a global user-tracking/battery-draining mesh network for that!
Just make a tag to place on the back of your phone that reflects a signal, and have a "remote" that when you press the button sends a signal and tries to catch reflection, beeping at a certain volume depending on signal strength.
It's just like those "speech to text" machine learning programs. It's fantastic value for people who can't write, but applied to everyone it has overall very dangerous and damaging consequences.
Just make a tag to place on the back of your phone that reflects a signal, and have a "remote" that when you press the button sends a signal and tries to catch reflection, beeping at a certain volume depending on signal strength.
It's just like those "speech to text" machine learning programs. It's fantastic value for people who can't write, but applied to everyone it has overall very dangerous and damaging consequences.