I was under the impression that any time an app allows you to play media and send it to audio devices (including Bluetooth and AirPlay), iOS 13 gives a scary prompt like this. I've been using the public beta and for this reason I have granted the permission to YouTube (while hoping I am right and they are not abusing the permission).

Does anyone know for a fact what Facebook is doing with Bluetooth permissions? Am I right in my understanding of how innocent usage for media playback can trigger this prompt?