I wonder why the big US banks aren't on board with driving contacless NFC payments? Commonwealth Bank, the largest bank in Australia is very soon releasing nat

I wonder why the big US banks aren't on board with driving contacless NFC payments? Commonwealth Bank, the largest bank in Australia is very soon releasing native Android NFC support and NFC style "smart tags" that you stick to the back of your iPhone. https://www.commbank.com.au/personal/online-banking/commbank-app/coming-soon.html https://www.commbank.com.au/personal/online-banking/commbank... This pretty much eliminates the need for any kind of "card aggregation". I wonder how quickly other countries will follow suite?