Sounds like you should build a competitor if that's literally all it is...

I suspect there's quite a few other things you have to consider when you're managing trillions of dollars of transactions a year. Fraud, settlement times, up times, security, customer service, debt collection, interest rate calculation, reach, KYC, record keeping, legal inquiries.

But I'm sure we're just a couple grok comments away from a competitor

Don't forget stand-ins, much of this hasn't discussed that credit card networks do a lot of "stand-ins" when the issuer is unreachable (bank goes down, latency too high, etc). It's a bit unclear how things like Wero would operate when a network issue hits as Wero and EU rails won't just assume the liability for the transaction and hope it clears later as it does on Visa/Mastercard.