Having an Alexa or Google Home doesn't seem any worse (or even less worse) than carrying a phone around everywhere I go. If you're worried that the device can be hacked to listen to you full-time (or that the provider is lying about it only listening to you after it hears the wake word), you should be worried about your phone for the same reason. Plus my Alexa isn't going to give google a map of everywhere I travel so they can see where I work, eat, shop, etc.