Interesting that this - https://en.wikipedia.org/wiki/Amazon_Coin is never, ever mentioned in this context. Amazon coins have been around for a quite a while now but you never hear anything about them. They're transferable between accounts but have limited uses.
Forgot about it, I saw it once when I was checking some e-books but never bother reading into what you do with those credits
There will never be a reason for them to create anything more than that.
So they could simply transform those gifts into a somewhat close resemblance of crypto.
Not that it would matter if it's not decentralized, not minable, not irreversible, not anonymous, not, not, not...
I'm willing to bet that if they do offer it and create some kind of wallets app in which to store it and use them to buy on amazon they would easily sell a few billion worth and have at least a few millions installs in the first week.
Probably the best way to finance a company without issuing shares.
Starbucks is sitting on billions in form of unspent gift cards.