Jannis Leidel announced the shutdown of Jazzband, a decade-old cooperative initiative designed to share the burden of maintaining open-source software projects. Founded over ten years ago, the organization operated on the principle of open membership where anyone could join and gain push access to codebases. However, Leidel stated that the model has become unsustainable and is now being wound down. The primary driver for this decision is the surge in AI-generated spam on GitHub, described by Leidel as the "slopocalypse." This flood of low-quality pull requests and issues has rendered the original open-access model dangerous. In an era where only one in ten AI-generated pull requests meets standards, and major projects like curl have suspended bug bounties due to low confirmation rates, giving broad write access to every member is no longer viable. The risk of malicious code injection and accidental damage has far exceeded the risks of human error that the model was originally designed to mitigate. Leidel also acknowledged long-standing structural flaws, noting that Jazzband effectively functioned as a single-person operation despite its cooperative ideal. Efforts to recruit more administrators or establish a formal management structure failed to gain traction. Consequently, critical decisions regarding project transfers, permissions, and infrastructure always routed through Leidel personally. He admitted that the sustainability concerns raised in 2017 were not addressed with the necessary financial support or infrastructure overhaul, and his subsequent role as chair of the Python Software Foundation further limited the time he could dedicate to the project. Parallel to these internal challenges, the broader ecosystem shifted. The introduction of GitHub Copilot in 2022 and the XZ Utils backdoor incident in 2024 highlighted the dangers of relying on burnt-out maintainers and open access without robust security. Jazzband's infrastructure eventually became a bottleneck, unable to support modern requirements like trusted publishing, prompting projects to seek new homes. For Django-related projects, Leidel specifically recommended Django Commons as a successor. This group already maintains several Jazzband projects and solves the governance issues by having a dedicated team of administrators. However, no equivalent ecosystem exists yet for non-Django projects such as pip-tools, contextlib2, and tablib, leaving these without a guaranteed new home. Over its ten-year lifespan, Jazzband grew to 3,135 members across the globe, maintained 84 projects, and facilitated over 150 million monthly downloads. Notable successes include django-debug-toolbar, which became part of the official Django documentation, and django-axes, which maintained a rapid release cycle for years. Leidel expressed gratitude to the 81 project leads and volunteers who kept the projects alive despite the operational bottlenecks. The wind-down process will not happen overnight. A detailed plan is in place to transfer remaining responsibilities, and project leads will be contacted shortly. While the experiment ultimately evolved into a single point of failure contrary to its初衷, Leidel emphasized that its core goal was achieved: it allowed thousands of developers to collaborate and ensured that critical software continued to be maintained and released. The projects will now transition to new communities, completing the cycle that was always intended.