I keep the mics on my Dots (stereo pair) turned off. When I need Alexa to do something, I just reach over and turn the mics back on.
My number one reason for owning the Dots is music (Spotify). I frequently find it much easier to use the Spotify app on my phone versus voice commands.
What I found most interesting about the video was the way Alexa always answered "do you work for the NSA?" She said nothing and then exited.