I worked at DeepMind as an AI researcher. I can guarantee you will not see "AGI" or "strong AI" in your or your children's lifetimes. It's fun to believe, it gives us something to look forward to, talk about with friends, and discuss on HN. But in reality, we are so far from artificial general intelligence, even with an exponential curve, it will take us 100 more years. The current deep learning era (or more aptly named, pattern recognition) will last another 5-10 years, at best. Then another winter will come.
RE: Siri and Alexa - Industry deployments of AI are a lagging indicator of what AI can do. AI is moving at two speeds: research and business/consumer applications. The research is moving faster than the apps.
AlphaGo and many other fundamental papers to come out in the last two years have done more than nudge the ball forward. They constitute significant steps, and bundled together they are an even greater achievement.
But I did raise a major objection, which is simply that his post is obsolete. It might have been reasonable to say what he said in 2014/2015. It isn't as we enter 2017.
Other people in this thread have already rightly stated that corporations are not superhuman AIs. This is true. Strong AI will be one or more models that operate as a coherent whole and be composed of machines, not humans. Corporations are mostly wetware. That's why they're not "artificial".
He claims there is a lack of incentive. That is not true. There is a well-funded escalation of research among large organizations that is well known and reported on, to the tune of hundreds of millions of dollars.
Why think that, though? Why not suppose that Strong AI would be distributed? Why suppose it would have a singular sort of intelligence? Isn't that basically a pre-internet way of thinking about AI? Maybe Super AI will be diffused across the environment, not having any sort of singular intent.