the purpose of the palm scanning and the ID checks is simple.
even if they set a daily limit of $500-$1000 for AML risk limitation. there would be nothing stopping someone using the machine multiple times to get around the limit. so they as for palm print to ensure no same hand uses the machine too often.
though that being said, i truly find the process not consumer friendly
The machine has an ID scanner. Why not just ensure one ID doesn't use the machine too often? Providing fingerprints is too much, I'd have no problem handing over my ID though.