I'm not an expert in this area. But a fairer comparison would be a US service like Venmo. In my experience Fraudulent payments with venmo are much harder to recover.

I think a lot of fraud prevention tech can reasonably be done in a matter of seconds. FedNow also proposes to be domestic only for the time being, which means the recipient accounts are in US jurisdiction and easier to shut down and prosecute. Finally, there's no reason a wait-period/cooldown can't be implemented in another layer.