Worried about money? They are already rich beyond their wildest dreams. They are, reasonably, excited about growing and expanding and building a company that does much more, but that is not driven by a need for money, it is driven by their ambition.

edit: I can’t speak for Adam etc., this is just my impression. My impression is that they want to build a business of which tailwind (the open source project) is one part. I think that regardless of money in the bank they would want to have revenue generating projects. Laravel is a good comparable.