Lot of people are already bringing up various concerns. I hope this is precisely what it does here in HN and outside. Talk about concerns regarding about these devices.

Is there anyway for end user to know what "wake up" keywords are? How do I know it's not listening for keywords like "buy" (example: "You should `buy` milk") and then targeting adds that way?

What happens next time FBI decides it wants google (et. all) to leave its device "always awake" on some person of interest ?

Can a third party somehow compromise the security to change the list of "wake up" word?

Maybe you can add voice recognition along with keyword to make sure it's only responding to authorized people. But even then, seeing how far machine learning has come, is it really a security?

On a side note, do these devices only capture human audible range of signals? Or is there ways to send non-human audible signals with commands and wake word and what not? Dog whistle for alexia or Home .. Alexia whistle?

Edit: typos and clarity