[rchaud]

You know how FB can create shadow profiles of people that have never had an FB account but were tagged on photos or comments? Same principle applies.

You may not buy an Alexa speaker, but if you're in the room having a conversation with someone who does, your name and personal information could leak as well. Same goes if the conversation was on a phone loudspeaker.

The voice data would have limited usability in its present state, but as Alexa's network effects improve, the signal to noise ratio will only get better.