Without an external incentive, most companies develop their software in their silos, even if it's not about the core business. When we compare the number of proprietary and open source software developers globally, we roughly estimate that more than 95 percent of the software developed as proprietary software. This over-protective approach results in companies making investments that potentially overlap and lead them to reinvent similar solutions. We could substantially reduce these overlaps and increase efficiency by explicitly investing in open source software and pooling resources. The EU can set up an open source subsidy program to create strong incentives for companies to switch from proprietary to open source. If a company declares to build their software as open source, they can/should get a tax break for each dedicated developer/employee via this program. How to accurately validate the information that companies will provide and the ideal size of the subsidy needs to be studied. The initial goal should be to encourage companies to open their non-essential software. In the long term, we should minimize proprietary and maximize open source to increase collaboration between companies and foster innovation in the software ecosystem.