Of course - if nobody used it Amazon would remove the button. I doubt that adding 1-click to some other site will greatly increase their sales - that is all I'm saying.
Yes, but adding 1-click also inserts an extra semi-step into every purchase: the choice of whether to click the 1-click button or the add to cart button.
Apparently Amazon finds that adding 1-click does more good than harm.
Like the article said, Apple licensed the 1-click patent from Amazon in order to offer the same frictionless experience to iTunes shoppers. This was for music sales, before the iPhone was even a thing, if memory serves me right.
Well since we're using anecdotal evidence, I would certainly buy from more stores if they had one click. There have been countless times I've abandoned a shopping cart because there was too many steps
Amazon didn't start out as an online retail behemoth. There was a time when that patent made them more competitive, especially in the early years of the online shopping experience.
Every step between a customer and completing an order is a loss of sales.