What exactly would they demand from them? A cryptocurrency exchange is not like a credit card company which has a direct relationship with every customer and vendor and is in direct control of transactions, instead they just handle buying and selling of decentralized currencies which are transacted permissionlessly on their own networks.

It's a lot more like cash, especially the ones designed for privacy.

That said, stablecoins might also be a target, since they have freeze functions, I could see that becoming a problem.

You don't need exchanges.

Presumably they do what Visa/Mastercard should have done, and tell them to shove it. It’s just a bunch of uppity idiots from Australia, no one HAS to listen to them…