I am okay if someone understands what Alexa and Google Home use your voice data and decides to use the products anyway. It does provide lots of convinience and is a cool assistant. However, Most people are clueless how it works and it's irresponsible to give up your privacy and those who visit your home by having bits of conversations throughout the day and night to become a permanent record on amazon and google servers.
Concerned? Check out
Google Home And Amazon Echo Quietly Recording Everything You Say. How To Stay Protected?