It doesn't seem like the scanner is required for these machines and it does so using palm-vein scanning, not fingerprints. They are doing so to prevent any sing

It doesn't seem like the scanner is required for these machines and it does so using palm-vein scanning, not fingerprints. They are doing so to prevent any single user from withdrawing over a legal limit in a day. "If enabled, the Palm Vein Scanner can limit a user's daily transaction amount by taking a unique, anonymous (no fingerprints) infrared picture of a customer's blood vessels to assist in AML compliance."