That's the thing, though, you can make money with open source software but only if your business model is not based on selling software. There are some companie

That's the thing, though, you can make money with open source software but only if your business model is not based on selling software. There are some companies for whom dual licensing work (e.g. AdaCore) but these are really the exception. Generally, selling open source software does not work, and not everybody wants to primarily sell server space ("web app" subscriptions), maintenance, troubleshooting and other developer services, SaS, integrated hardware+software solutions, printed documentation, etc. Some people want to sell the software they make without being an employee or contractor or billing for something else than the software. I believe there is a place for proprietary software. My personal solution is to do both, sell proprietary software and publish some of the libraries involved in it as open source.