Indeed, there are quite a lot of “bluetooth finder” or “bluetooth scanner” apps on the iOS app store. They’re mostly advertised as helping you find your missing earbuds. Some will show a history of bluetooth contacts. They just need to start keeping track of bluetooth devices that are persistently around you but not paired to any of your devices and put up an alert about those. A lot of those would be innocuous, of course (my wife’s earbuds, etc), but you could add those to an “ignore” list.
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