Earlier quoted context omitted.
Presumably they mostly stole ETH because tornado cash is the best mixer around to launder stolen funds
I'd love to read more about these money laundering operations like Tornado Cash. Are they just straight up 100% fraud companies? Do they have any pretense of a legitimate use case or does everyone just understand they're used for criminal activity? Are they regulated at all? I assume you have to trust your magic beans to them at some point; do the money launderers sometimes just steal them? What do they charge for th…
Since zero-knowledge cryptography is used to ensure the generated note cannot be linked to the depositing transaction, it can be used to send money to yourself or another person without revealing the identity of the sender. There are criminal and non-criminal reasons to do this.
Because it is a smart contract system, you do not have to trust a person or organization with the money. You do have to trust the smart contracts defining the system are correct. The smart contracts are publicly available to read and have been reviewed by many people, including software audit organizations.