Amazon bought ethereum domains, yes. But they commented their move.
Amazon stated they are not going to implement altcoin payments yet, because there is "too little demand".
But they wan't to be "prepared" for the future in which crypto currencies are being widely accepted as payments.
Amazon already bought bitcoin domains, i think, about 4 years ago. But there is still no option to pay with bitcoins.
I wouln't derive too much from those news. As soon as BTC will get adopted massively, amazon has the ability to follow instantly.

A short summary of the interview can be found here: https://cointelegraph.com/news/amazon-sparks-speculation-by-buying-three-cryptocurrency-themed-domain-names