This is bad but inevitable
On the face of it it sounds like the staple of a lot of Sci-Fi novels - a house run by an AI which answers you questions, keeps your appointments, reminds you of things, orders pizza, books tickets and offers advice and encouragement when you feel a bit low.
This would appeal to a lot of people and that's why it will become popular (if not in this incarnation but the next or the one after that).
Unfortunately, the AIs in Sci-Fi novels are all run locally, they are loyal to you and they are under your control at all times. This Echo thing is anything but - it's an agent of a third party permanently present in your home. It is controlled by that third party, it works for that third party and it serves only that third party's interests - but it feels as if it works for you.
And because of how it feels a lot of people will be too ignorant to see the difference until it's too late!
This system is a trusted element in you home. "Trusted" means an element which, if compromised, compromises the whole system.
In Sci-Fi novels your AI is a trusted element which is secure unless compromised by the villain-du-jour, which may make for an interesting plot twist. With Echo it comes to you already pre-compromised.
I guess the correct classification for that gadget is "trojan horse"
Biting the hand that feeds IT
