A handful of SDN-mentioned pools still have an “operator” permission. Of those, two belong to very outdated, now-unused variations of Tornado Cash. The remaining swimming pools either have more recent, immutable versions, or ended up utilised so minor that they had been likely ignored over the Could 2020 closing update. https://gatedperth.info/how-tornado-cash-enhances-privacy-for-ethereum-and-bnb-transactions/