Tuist, a build tool for Xcode projects, has been partially closed-source by its maintainers, forcing Bitrise to deprecate its support. This move raises concerns about the reliance on open-source projects without proper governance, potentially leading to unforeseen challenges in the future. Bitrise is recommending that users reassess using Tuist and consider alternatives like Bazel, a tool with a strong and impartial governance body, which allows for multiple options, including open-source self-hostable projects and no vendor lock-in. The situation highlights the importance of open-source stewardship and community engagement in ensuring the sustainability of open-source software.