NY Times: Hear That? It’s Your Voice Being Taken for Profit. by Joseph Turow (“Based on voice signatures, patented Google circuitry infers gender and age. A parent can program the system to turn electronic devices on or off as a way to control children’s activities. Amazon already claims that its Halo wrist band is able to identify your emotional state during your conversations with others. (The company assures device owners that it cannot use that information.) Many hotels have added Amazon or Google devices in their rooms. Construction firms are building Amazon’s Alexa and Google’s Assistant into the walls of new homes.”)
The article doesn’t mention it, but government access to the information via the third-party doctrine is entirely possible.