In a collaborative effort, Apple and Google have developed an industry-standard detection feature called “Detecting Unwanted Location Trackers” (DULT) for Bluetooth trackers. This standard allows users on iOS and Android devices to be alerted if an unknown Bluetooth tracker is monitoring their location.
I’m guessing they mean using it as an anti-theft device. If a thief steals an item with a tracker in it, they’ll be notified of the tracker’s presence by their phone and remove it. Of course, these trackers aren’t anti-theft devices and you probably shouldn’t use them to try confronting a thief on your own anyway…