Your headphones aren't spying on you, but your apps are. Here is why
Have Your Bose QC35s Been Sounding Weird? You're Not Alone (and There's a Fix)
Auriculares Bluetooth con Cancelación de Ruido Bose QuietComfort 35 II: Auriculares externos Inalámbricos con Micrófono Integrado y Control por Voz de Alexa, Negro : Amazon.es: Electrónica
Bose QuietComfort 35 II Headphones Gain Alexa Support via Software Update - MacRumors