Both sets of people can be present in the same company. There have been postings in the F# forums of devs wanting to use F# because they know it's good, but being very clear that corporate policy is going to restrict them unless certain conditions are met. Whether IP concerns from open source contribs is one of these, I dunno.

Nitpick: F# is really a multi-paradigm language. It truly does provide OO, functional, scripting and interactive styles.