Because it's a perfect competition market and there are no significant differences between players, they all offer the same catalogue and almost the same user experience.
This conclusion is a big leap, even as per the article you shared. "The strength required to access the high calorie content of bone marrow may have played a key role in the evolution of the human hand and explain why primates hands are not like ours, research has found."
It's just a possibility. They can't even make a strong claim about it.
Personally I Think Paul Graham is very under appreciated, his legacy on the Startup ecosystem and zeitgeist will probably only be recognised many years on the future.
It's a great pity that he doesn't write these wonderful essays for some time now.
Read his book, Hackers and Painters. I don't think he's under appreciated. He was way ahead of the curve. And deserves to be happy with his family, or change the world some more..
I am sure he can console himself with the Scrooge McDuck like vault of money to swim in he must be able to build at this point, with all of the successful YC exits. Which the essays did a lot to create. He became tech world famous through his essays, which then gave him the clout to launch YCombinator.
(Are there public estimates of his current net worth?)
