A big fat ZERO!
I'm sure it's far from over, they definitely earmarked 100s of millions for this, I know of a big e-commerce they offered a lot of money to implement Amex checkout. The only question is if it will be ez money making or discounts like v.me.
Who?
Amex
Which big E-commerce did they offer a lot of money to?
One of the top 50 in E-commerce, I don't think they would like I should name them.