I doubt they actually think a Haskell client is going to be one that "matters". It's a fun bit of software, take it for what it is.

Also, if you google "factual api", you get http://developer.factual.com/display/docs/Factual+Developer+... as the top result. Unless you're faulting them for not releasing wrappers in all languages simultaneously, I don't really understand your point.