Aside from keeping that money locked into their ecosystem, If you buy coins from az with cash, all the coins in circulation, essentially is an interest free loa

Aside from keeping that money locked into their ecosystem, If you buy coins from az with cash, all the coins in circulation, essentially is an interest free loan of dollars to amazon, which as long as coins are in circulation are never fully repaid. Then you have the gift card problem, where some percentage of the, coins in this case, is never spent, free money to amazon.