AI and rising costs push popular open-source libraries toward paid licensing models

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Several widely used open-source libraries in the .NET ecosystem, including AutoMapper, MediatR, Fluent Assertions, and MassTransit, have recently shifted to commercial or dual-licensing models, citing long-term maintenance costs. Frontend UI libraries PrimeNG, PrimeReact, and PrimeVue have also announced that future major versions will no longer be open source. AI is seen as a compounding factor, as maintainers increasingly face floods of AI-generated issues and pull requests that are difficult to review despite requiring significant human effort. Developers are also growing concerned that publicly shared code may be used without permission to train large language models or to quickly replicate GPL-licensed work in closed-source products. While open source is unlikely to disappear entirely, these converging pressures may fundamentally change how and whether developers choose to share their work publicly.

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