Note that none of the successful large companies are actually open sourcing their 'secret sauce'. There is no open source version of Google's search engine, Facebook's social network etc. It's only supporting tools and infrastructure they release (i.e. commoditization of their complements or dependencies.) A product company open sourcing their core product is committing suicide on the product front. Sure, there will be services companies who may benefit (Red Hat or providers like AWS etc.) but the company that actually produces the software rarely will.