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Google needed email to run it's business. They built a customer facing service around it.
Computing answers is their thing. With their machine learning cloud services, anyone can compute answers for their complex problems.
Companies that stagnate tend to iterate, with little to show for it, on a few "core" products.
While they're too big to collapse altogether, I'd put Oracle, MS, Yahoo, and numerous others in that group.
Possibly Facebook. They're no where near as diversified as Amazon or Google. If the bottom falls out on buying eyeballs, they're in for a world of hurt.
... "Sapolsky quotes American cognitive scientist Marvin Minsky in support of the position that free will is really just “internal forces I do not understand.” ...
I never liked this argument. By saying it's "internal forces", subconscious struggles within myself, seems to conclude we've learned all there is to know about "physical reality".
We can't see beyond the boundary of our own reality (universe). To say we're certain reality only exists within those boundaries seems dubious.
It's that there is a huge population that relies on that work, and if you haven't noticed, our culture is pretty terrible about offering alternatives.
So should this large swath of people suddenly be on their ass, or even not so suddenly but over time, with no alternative, shit will get real.
Your hard cold facts approach forgets humans are emotionally volatile, and as we're seeing, our social structures not as stable as we tend to believe.
You seem to believe that should the bottom fall out, your cold hard facts about reality will spare you the wrath of a hungry populace.