The whole "average person doesn't care about privacy" while generally true, is in my opinion, a cop out that allows us software developers to hand wave away the ways we monetize people. Also, I can see how my friends who use alexa (and google for that matter) have adapted their vocal cadences and vocab to interact with the device. And at the end of the day it is a way for people to play music, get news/weather reports, and order more goods. All things that are already very easy on smartphones/web browsers.
As for Go, I have never seen a corner shop, either in the US or in Europe, with such a tiny density of goods. It is designed to look like a Safeway or a Kroger but then is "intentionally" a small store. It's fine if this is still in the trial stage but that is what it felt like, instead of feeling like an actual shopping experience I would use day to day. Also, there was no one else in the store at all, during each of the 3 times I went, so I am still going to wonder what the success rate will be when tracking lots of people constantly picking up and putting down items.
And sorry for the confusion, I'm not saying they aren't successes. I'm just saying that they are not world wide game changers like Prime and AWS as the original poster said.