Sadly in my experience it is common for F# given its finance background at least historically, particularly in London/Europe. There is a culture of not showing your cards in these environments having worked in a few of them, and quietly being a success. Its an "arms race" with your competitors after all - only people in the industry jumping between companies have an idea what their other competitors are using often sometimes with "non-compete" clauses. Meetup's/conferences/articles showing your work are often explicitly banned or at best not encouraged by the companies for commercial reasons.