Privacy is a huge topic in the ultrasonic audio transmission space right now, and it's definitely not something Amazon would take lightly. The potential for gat

Privacy is a huge topic in the ultrasonic audio transmission space right now, and it's definitely not something Amazon would take lightly. The potential for gathering metadata is there for sure, but as another commenter alluded to I would be more concerned with devices with microphones + rechargeable batteries. I haven't read the Alexa / Echo terms closely yet though. (Disclosure: I previously worked for a company making competing tech.)