How can a beacon service that can detect whether other iPhones in your general area are in your contacts be totally private secure and totally anonymous and to

How can a beacon service that can detect whether other iPhones in your general area are in your contacts be totally private secure and totally anonymous and to anyone let alone the local government's intelligence service? Have you ever used airdrop? I don't understand why anyone would expect a high degree of privacy from this application. I think it demonstrates how when you are a large enough entity you get totally blamed for everything no matter what. Make it totally anonymous to send to everyone and you get blamed for creepers sending anonymous dick pics. Don't make it anonymous and you get blamed for the government spying on users en masse because they can track you within bluetooth radius.