Ah, it seems you're one of many who confuses "crypto" with cryptography and cryptocurrency. Cryptography is used for encrypting your files, not cryptocurrency. But it's a easy mistake to make so don't feel bad over it.
Literally the only reason ransomware is a thing is because of cryptocurrency.
Every oil pipeline, school, hospital, farm, old age home that's ransomed is 100% thanks to Bitcoin and its progeny. But hey, at least it's found a use case.
> One of the first ransomware attacks ever documented was the AIDS trojan (PC Cyborg Virus) that was released via floppy disk in 1989. Victims needed to send $189 to a P.O. box in Panama to restore access to their systems, even though it was a simple virus that utilized symmetric cryptography.
Attackers who encrypt files and demand payment famously demanded cryptocurrency, in part because of the "transactions cannot be reversed" property and the (pseudo-)anonymity.
As banking transactions can be reversed and are as opposite of anonymous as is practically possible, it would be (darkly) amusing if a traditional bank did that, precisely because the damage would be undone and the guilty parties trivially identified.
They're referencing the fact that crypto is famously used as a payment mechanism by entities that hold people/companies to ransom by encrypting their data against their will.
