Next up: Kryptos part 4 (https://en.wikipedia.org/wiki/Kryptos)

Unfortunately, the totality of the evidence very much indicates that Sanborn went "buck wild" with the enciphering, he made mistake(s), or both. So this is very much in line with the Chaocipher challenge of 1990. Nice little earner for some people though.

First thing that came to mind. I imagine this has cross their minds to.