That’s not a claimed benefit. The article says it only tracks how many people you know are around you, not who they are. Apple’s usually pretty on top of this

That’s not a claimed benefit. The article says it only tracks how many people you know are around you, not who they are. Apple’s usually pretty on top of this kind of thing. For example, there was the privacy-preserving Covid proximity thing, and I believe the Find My network works without allowing others to track you? Is there some fancy cryptographic algorithm that allows a person to broadcast something that allows others that already know them to recognize that a person they know is broadcasting (perhaps not even a specific person, just one they know) - without allowing people they don’t know to recognize they are the same person if they see them again?