> ... and you can't change your mind later.

Is that a typo? Isn't GDPR the implementation of the right to be forgotten plus "left-the-fuck-alone after used your shitty site for 0.5 EUR to buy an emoji"? So you can request removal of all your personal information.

Yes, Amazon needs your delivery and billing address, but they don't need the delivery address after delivery. So you can request them to delete it pronto! And the billing stuff has to be kept for 5 years, and must be used for tax administration purposes only, no spam, etc.