It's certainly harder, I agree. We have highly sophisticated, non-deterministic image recognition. We don't have to be perfect to have a significant impact, and to stop the 99.x% of amateurs.

> Paper money being almost non-fungible is a great achievement

Going off on a tangent: Many people in technology and in the public look at cash as backward, boring, even socially embarassing technology. I think few it's amazing technology, an incredible hack: tech we struggle to implement in computers is implemented highly successfully and reliably in a piece of paper.