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Matrix protocol’s sole purpose is to obscure usernames and messages and enable privacy. Tornado Cash’s sole purpose is to obscure blockchain addresses and enable privacy. Privacy is not a crime. Using Matrix to hire a hit-man would be a crime, but we don’t sanction the Matrix protocol or it’s developers just because it can be used by criminals to obscure their crimes.

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What's the practical difference between the kind of privacy Tornado Cash provides and the kind of privacy offered by a local money laundering operation? If there is none, why should the latter be illegal while the former remains legal?

One exists to facilitate privacy, the other exists to facilitate money laundering.

Compare with E2EE Matrix protocol: it does not exist to facilitate criminal communication, but it does facilitate criminal communication.

TC is also different because it is an open source protocol, not a legal entity or group. You deposit funds into the protocol, and anybody in the network can help you withdraw them by relaying your transaction. It is a set of rules that any group of people can follow to allow for private transactions, and the same protocol can run on many blockchains.

Writing is used by criminals. Should writing be made illegal?

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