http://www.washingtonpost.com/blogs/the-switch/wp/2018/05/24/hey-alexa-come-clean-about-how-much-youre-really-recording-us/

We’re learning an important lesson about cutting-edge voice technology: Amazon’s Alexa is always listening. So are Google’s Assistant and Apple’s Siri.

Putting live microphones in our homes has always been an out-there idea. But tech companies successfully marketed talking speakers such as the Amazon Echo and Google Home to millions by assuring they only record us when we give a “wake word.”