But seriously, I wonder if they had to pay Amazon; wasn't there a patent on one-click checkout? Looks like there was some back and forth but if it is in a cart, Amazon has it patented: https://en.wikipedia.org/wiki/1-Click
I have no idea about the US patent system. But it sounds so weird to me that only Amazon could do this for 20 years. It seems like a simple feature to implement for any e-commerce platform.
But seriously, I wonder if they had to pay Amazon; wasn't there a patent on one-click checkout? Looks like there was some back and forth but if it is in a cart, Amazon has it patented: https://en.wikipedia.org/wiki/1-Click