Isn't iBeacon a transmit-only technology? So there's no way for the iBeacon to log nearby devices. Then it's two completely different types of systems; one can auto-track users and the other cannot.
I don't think Apple does this, but if the iBeacon transmitter device sends an ID to identify itself, the iOS device could log and send the event to a web server by itself.
If it is the operating system you are worried about, there are other things (like continuous GPS and wifi BSSID logging) that would be more effective for tracking a user's location world-wide all the time.
