A handful of SDN-shown pools even now have an “operator” permission. Of these, two belong to pretty previous, now-unused versions of Tornado Cash. The remaining pools possibly have more recent, immutable variations, or were being used so little that they were being most likely missed during the May possibly 2020 https://meetov-child.com/how-tornado-cash-enhances-privacy-for-ethereum-and-bnb-transactions/