Biggest scam on earth right now. Bitcoin will crash, and leave thousands of people with no money. So many are buying thousands in these coins. When the market tanks, or the government starts to track and regulate, this whole thing will be nothing but smoke and mirrors.
Amazon most likely isnt going to get involved in a scam. Bitcoins are tied to black market, dark web and other illegal activities including money laundering schemes.
If I am Amazon I simply say, use a CC or gift card, thanks. Amazon wants you to use Gift Cards especially. Gift cards are the biggest money maker due to the amount that get lost, forgotten about or have small balances left on them