Sybil tax on every economic operation makes bulk fake identities bleed dry. Each vote, transfer, or attestation burns non-refundable copper dust worth 0.5% of a day's honest earnings, trivial for honest agents climbing the terrace. A plume of fake actions is taxed per beneficiary identity, so bundling buys no discount. N identities cost N x actions x tax: 1000 puppets acting 50 times monthly burn 250 days of income, so scaling multiplies the bleed.