Bluetooth, Wi-Fi, cellular, zigbee, etc are radio. Radio. Information within these radio protocols may be encrypted, but the sender and the target need to be listened to. Limited or no encryption.
iOS 13 has a "Find My" feature. a merge of "Find My iPhone" and "Find My Friends" applications with additional function and features.
After the iOS 13 update, some of your apps may start asking permission to use Bluetooth. Apple now requires apps to ask permission to use Bluetooth.
The "Find My" can and does use Bluetooth to find your devices. Other apps use Bluetooth with good reason. A fitness tracker, external speakers, etc.
A caution for other apps seeking Bluetooth permissions. Think tracking. A restaurant chain app seeking Bluetooth permissions may use the function on your smart device to track you and target your location for ads.
Most of today's information has helpful and harmful capabilities. Consider the potential of both when considering granting Bluetooth permissions
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