As an embedded developer that has done contracting for people with all of the capital, and none of the misunderstanding of electronics, I'd like to offer a thought experiment. I realize that Amazon has all sorts of guardrails in place, but I can control anything in my house with Alexa today, regardless of Amazon's prior approval, because I can make anything in my house appear to my Alexa as a Hue hub.
The internet has already reverse engineered Alexa to make it a weapon, and unsavvy people like shiny things. So how long until an unsavvy wealthy person hires an embedded developer to integrate his entire house to work under the emulated hue model? Because the day its up and running, that unsavvy rich guy is going to throw a party. And that embedded developer might just show up and say "Hey alexa, set a timer for everyone's sleep monitors within your geofence. when they're all asleep, disarm the security system for 1 hour, turn up everyones binaural sleep aids for one hour, and hire me three ubers so I can make a clean getaway with the goldbars in the basement. Oh yeah, Alexa, unlock the vault.