I would argue it is zero sum ("you've got some fraud" vs "you have no fraud") if there is any great volume of transactions and what's being sold is valuable, and/or marketable at a black market price below retail, and/or offers fraudsters liquidity options. I am skeptical because an untrained system is going to make mistakes out of the gate, even if it's trained on oodles of transactions from other businesses. Anti-fraud isn't a one-size-fits-all game.