But business success is largely orthogonal to language choice. I.e. when you buy a paid Github plan do you check what language they write the site in?
Of course a strongly typed languages should tend to have less bugs and that will save money. But saving money is only useful for those with revenue to being with.
There are a number of successful startups and very large companies using Haskell. It's understandable why it isn't a common choice, of course; the potential employee base is fairly small.
