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The 30% rule is based on the conviction that any partner who profits financially from an open source project should be able to contribute a part of their turnover to the overall sustainability of the project, i.e. up to 30% of Decidim's official budget. This principle is not only a financial strategy, but also a reflection of Decidim's open source philosophy and social contract. It is a commitment to shared responsibility and mutual benefit that underpins the ecosystem for its long-term viability. It provides a steady stream of revenue that can be used to maintain and improve the project, ensuring its continuous development and adaptation to new needs and circumstances. In addition, it fosters a sense of ownership and commitment among the partners, strengthening their relationship with the project and encouraging their active participation. The 30% rule also aligns with the principles of equity and reciprocity. It ensures that those who benefit from the project also contribute to its maintenance, creating a balanced and fair relationship. This not only improves the financial stability of the project, but also reinforces its ethical and social values.