No, it really isn't. What is the goal there? To prove you can use a general purpose language to write software? There's tons of software already that proves that. How many haskell projects need to exist before it has proven itself or whatever it is you are expecting from this? If I write enough haskell software, the industry will just suddenly stop using bad languages to write bad software and poof care about quality miraculously? How is the industry supposed to know I have written this haskell software if I am not allowed to talk about haskell, or writing software in haskell, or how good haskell was for writing software when I used it? And why is haskell the only language where nobody is allowed to talk about it or they are variously branded smug, arrogant, academic blowhards, etc, etc?
I can point to a hundred things I use every day developed with python (package manager, reddit, instagram, etc.) but the only thing I can think of that was built in haskell is Facebook's spam filter.
This makes me uncomfortable. Use in a particular niche sector does not preclude use in a different sector. Finance may well secretly use all of these weird high-level languages (though how would you falsify this?), but that still doesn't explain why you don't see them anywhere else.
So either finance is amazingly brave or well-suited to niche functional languages (in which case use in finance proves nothing), or it's a conveniently reputable-sounding use that doesn't actually require any proof. I, for one, will continue treating visible, published software (and libraries) as a useful metric of programming language usefulness and popularity.
I'd say it's the opposite: use in visible, published software and libraries is a very specific niche (or rather two specific niches: OSS and webdev), and not representative of software as a whole. The open-source community is a Unix- and therefore C-oriented community; a lot of Haskell work happens at Microsoft, and a lot of JVM work happens at Oracle, and a lot of OCaml work happens in Europe, which puts all those things somewhat at odds with RedHat. Webdev is uniquely ill-suited to typed languages because of the history of browsers and HTML in particular. If you just looked at published software/libraries you'd think no-one was using Java or C++, when those are likely still the most popular languages in software development as a whole.
facepalm
Perhaps some Haskellers should take the effort and develop a really sophisticated Haskell IDE which Haskell beginners could follow and use to learn and advance in Haskell. Theoretic knowledge about Haskell is good but practical application is another thing.