While I understand that this is just an exercise/whatif/fun, it seems that these exercises favor the pretty over the functional. There are some niceties in the design, like the braille. But beyond that, fundamentally, currency should not be easily copied.

There doesn't seem there was much thought about that in the designs, other than the wavy web-like background. I think that would make for a much more interesting (to me at least) case study in design were that the case.