CTA in Chicago takes Apple Pay, as does Ventra (the commuter rail app) and WMATA in DC is supposed to soon I think. Surprised Canada hasn't caught on to that.
I don't know that they haven't - I assume those four cities support some additional integration with Google Pay over just paying for tickets.
My local commuter rail "takes" Apple/Google Pay in the sense that you can buy a paper ticket via contactless payment - there are no turnstiles or fare collection, making it essentially an honour system.
Melbourne-resident here; Myki is there because it's a horribly implemented system to the point where, while most cities will just use a Visa/Amex/MC backed system, we needed to keep our specific transit ticketing because... reasons. It's really bad.
Chicago's CTA only accepts US cards, even when paying with Apple Pay. My international cards weren't accepted at all, the card reader failing with a generic error message. I didn't expect Apple Pay being declined, though.
On the other hand, both Las Vegas and Portland transit systems readily accepts foreign cards.
