A handful of SDN-stated pools continue to have an “operator” permission. Of those, two belong to very old, now-unused variations of Tornado Cash. The remaining pools both have newer, immutable versions, or have been employed so small which they have been very likely disregarded through the May 2020 remaining update. https://politique-defense.com/tornado-cash-explained-how-it-ensures-unmatched-confidentiality-on-ethereum-and-bnb/