2) No matter how many steps you take to keep your privacy, it all ends up in a doxed situation (your Amazon account, which contains your full name, address, and contact info) so what's the point? Im sure Amazon keeps that data.
Exactly. There is no "privacy" when ordering something online to be delivered to your house.
If you ever had a financial review by a government
If you're currently breaking the law, then indeed you'll have a problem.
or in the future the government became increasingly tyrannical about cryptos and he was to force either Bitrefill or companies that accept to have their giftcards filled through Bitrefill, to disclose this information, the government would know that you have or have had Bitcoin, this is a problem.
If you have to worry about what a future government might do retroactively, you have bigger problems than buying an Amazon gift card.