I remember the excitement back in the day when Overstock adopted crypto payments - I think it was in 2013 and it was the precursor to the big bull run that happened that year. (The other big event that year was Cyprus seizing the savings from their citzens in a "bail-in" and some company's payroll cash that was sitting in their current account ready to be paid out as wages got seized too - and people suddenly saw the benefit of having your own wallet).
So yeah, Amazon enabling crypto is another big milestone on the crypto journey.