“How do you make money if you give away the source code?” Anyone outside the software industry, encountering open source for the first time, asks some version of this question. Open source is the development model in which the program’s blueprint — its source code — is made public, so anyone is free to use, modify, and redistribute it. On instinct, it looks like a business that cannot possibly work. The short answer, though, is that it works. It works on an enormous scale.
In 2019, IBM bought Red Hat, the open-source company best known for its Linux distribution, for $34 billion. That is the price IBM was willing to pay for a company whose software anyone can download for free. The investment was not a fantasy. According to one industry estimate, Red Hat-related revenue over the five years that followed came in at roughly $30 billion, and IBM’s market capitalization climbed from $105 billion to over $200 billion over the same window. And it isn’t only Red Hat. Elastic, which open-sourced its search-engine technology, now posts annual revenue approaching $1.5 billion. HashiCorp, which builds infrastructure-automation tools, generates several hundred million in annual revenue of its own. In one industry survey, more than 90 percent of respondents said they planned to maintain or expand their use of open source.
The trick is, in the end, simple. Open-source companies don’t sell the code; they sell what surrounds it. The fact that recipes are freely available on the internet hasn’t shut down restaurants. Even with the source code public, deploying it reliably across hundreds or thousands of servers, responding instantly to security vulnerabilities, fixing outages that erupt at three in the morning, meeting compliance requirements — these require specialized people and accumulated experience. Enterprise customers pay willingly for exactly that peace of mind and convenience.
The revenue models have multiplied. There’s the “open core” approach: keep the core functionality free, charge for enterprise-grade security and management features. There’s the subscription model that lets you use the software in the cloud with no installation. There’s the bundle of technical support, training, and certification sold as a package. Google has gone a step further, open-sourcing the core engines of its Chrome web browser and Android mobile operating system as an indirect strategy to expand the search-advertising market that actually pays the bills. Thanks to this diversity of approaches, the global market for open-source services is estimated at over $40 billion in 2025 and is projected to clear $100 billion in the early 2030s.
The picture isn’t all sunshine. Large cloud providers like Amazon Web Services have taken open-source projects and repackaged them as their own paid services, sparking the now-familiar “free riding” complaint that the original developers are left with no revenue. MongoDB, Redis, and others have responded by tightening their license terms — a move that directly collides with the founding philosophy of open source, the one that says it should be open to everyone. A few companies have gone all the way and abandoned open source entirely for paid-only models. The tightrope walk between the ideal of openness and the reality of staying in business is being performed in real time.
The latest front is artificial intelligence. As Meta’s LLaMA series and other releases publish the core parameters of AI models, companies are tuning them to their own environments to cut costs and lift performance at once. PayPal said publicly that, after an initial deployment of open AI models, specific business processes ran 50 percent faster and time-to-market shrank by a factor of five. In the AI era, the commercial potential of open source is not contracting — it’s expanding.
Here is the paradox at the heart of open source. Distributing something for free can produce faster and broader market penetration than selling it as a proprietary product, and once a technology takes deep root, far larger commercial value blooms on top of that ecosystem. “Free” is not the end of a business. It’s often the smartest possible beginning.