This risk check initiates when a shopper has committed fraud anywhere on Adyen's network, including with other merchants. The threshold by which a shopper is put into this category includes the diversity of payment methods they have entered, as well as their Issuer responses.
ShopperDNA is tracked across Adyen's entire network, allowing aggregation of both good and bad signals across verticals. With this check, it is possible that a fraudster may have committed fraud with another merchant and the check triggers on their first interaction with a new property. While the check cannot be transparent about the source of the fraud, it is nonetheless extremely powerful in being able to predict fraud on even a first-time interaction.