Uhum! And this is news? The mere fact that Alexa is connected with the Internet and answers questions is telling you that you invited a listening device into your home.
FYI: Anybody wearing a smart watch put him-/herself on a technocrat's leash.
Every mobile phone is an f-ing listening device, spies of the 60s could only dream of, and so far I haven't seen any smartphone that isn't dominated by either of two monopolists.