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Why we built our startup in C# - .NET Blog
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F# is such a fantastic language.
I'd not hesitate a second to use it (and Fable) for my own startup. I'm very comfortable with Ruby, Clojure, Haskell, Perl, PHP, Python, Java, Typescript, and C#. Yet I would pick F# over all of those in a heartbeat.
F# has great type safety (but not forced into monad transformer chaos like Haskell). You need about 1/3rd less code than C# and Java, and the compiler will find more bugs than in those languages.