Achieve defensibility through transparency rather than secrecy in commoditizable markets
In markets where software isn't the main differentiator, open-sourcing creates defensibility by eliminating the competitive threat - no one can undercut you on price when core product is free. Competitive advantages shift to execution, support, hosting convenience, and ecosystem strength rather than code ownership.
When to use
When entering markets with established incumbents where software itself isn't the primary moat, or where trust and security are critical buying factors (banks, enterprises)
Don't do this
Keeping code proprietary in commoditizable markets, creating opportunity for open-source competitors to undercut you while building trust advantage
1 Founder Who Did This
Open-sourced core product competing against proprietary DocSend, emphasizing that giving away core product means no one else can undercut pricing while enabling code audits for enterprise trust