In my opinion open source software is usually not a ready to use product. More often is a library, a framework or a product prototype that need to be tailored,

In my opinion open source software is usually not a ready to use product. More often is a library, a framework or a product prototype that need to be tailored, installed, configured, expanded and maintained by other developers do be useful and produce value. So I see it as just an agreement between developers to share efforts on build base software tools on which grow own private business. It we want to compare it to a traditional business is like a group of farmers that agree to share for free the best of seeds each one produce. So that everyone can grow a better harvest every year. So the business is not in the seeds and seeds producing, but in what you grow from that seeds.