They do it through exclusivity, through undercutting competitor prices (seriously, their ToS flat - out state that if you publish a book on Amazon, the price has to be equal to or smaller than at any other retailer), and through policies and algorithms that create advantages for those who play along, and massive hurdles for those who don't. (ask.aliannedonnelly.com)
As such, the business has a seemingly massive hurdle to surmount prior to beginning operations: it must first make pot legal in the U.S.A. (inc.com)
The Upromise card comes with a series of massive hurdles, the Chase only offers 5 % back during limited periods of time, and the Amazon Prime store card can only be used on the website. (valuepenguin.com)