Too Long; Didn't Read
Historically open source low-level protocols and tools are strived staying free. There is an ideology, on the one hand. There is a strategy, on the other hand. Metcalfe’s law (<a href="https://en.wikipedia.org/wiki/Metcalfe%27s_law" target="_blank">2</a>) states that the value of a telecommunications network is proportional to the square of the number of connected users of the system (n²). Hence, if it is free of pay, it has a huge intrinsic potential to survive. But the history is telling us a different story. Building a community-driven product is not similar to selling a community-driven product. It takes much time, money and other resources. No doubt, Linux is a great technological product. But a minority of products have become a great Linux-based business.