Totally insane idea. It’s fine to spy on other people so long as they don’t spy on you?
Your shrill concern driving trollies aside, I think the point isn’t to spy on other people as much as it’s simply a way to know if someone you don’t want to see is in your area.
It’s the digital equivalent of entering a store and spotting someone you don’t like, then turning around and leaving.
Also, the only people that are going to pop up on this app are people that opt in to be tracked like this in the first place. I could see your point if it was some nefarious opt-out thing that secretly tracks people without their knowledge, but it’s not that thing and therefore, your point is invalid.
