Well, they would have to use proprietary libraries. Which isn't all that uncommon now either. As a programmer I'm immensely thankful that most problems can be

Well, they would have to use proprietary libraries. Which isn't all that uncommon now either. As a programmer I'm immensely thankful that most problems can be solved with some MIT licensed thing that gets rubber stamped by legal so I can bypass all the corporate bureaucracy involved in buying proprietary licenses. I also suspect proprietary enterprise libraries would share a lot of the bloat and confusing interfaces that enterprise application software gets, since us the users get cut out of the feedback gathering process.