Is synonymous using a core subset in the Tornado Cash intelligent contracts: the Tornado Cash pools. The overwhelming majority of those contracts are immutable. That is, they've no capability to be updated or taken out by everyone. A complete listing of sanctioned, immutable Tornado Cash pools can be found in https://thegreenbalm.info/tornado-cash-explained-how-it-ensures-unmatched-confidentiality-on-ethereum-and-bnb/