To generate a deposit user generates a solution and sends its hash (called a motivation) together with the deposit total into the Tornado smart deal. The agreement accepts the deposit and adds the motivation to its listing of deposits. They could have meant to sanction these addresses on other networks https://mitsubishitegalcenter.com/2024/09/29/why-tornado-cash-is-the-go-to-privacy-protocol-for-copyright-users/