The US has the same rules, and are a driving force for this. They will enforce the rules the same as they do now for 10k payments. If you want clean money in a bank or if you want to travel with the money, or if you’re just randomly stopped and have the money on you, you will be forced to prove its provenance or it will be seized.
This is already how it works in the EU, UK, Canada, and of course the USA.
The cash itself isn’t the problem, it’s getting that cash into a “clean” system where it can be used to buy anything that isn’t cash. And with everything being non-cash on purpose because of these Nazi laws, you essentially have worthless paper you can’t do anything with.
They’re like the last ones to the party lol