The FUSE for macOS project, previously open source, is no longer open source due to its maintainer Benjamin Fleischer's decision to change the license. The project's code is now closed source, and companies that want to use it in commercial software need to contact Fleischer for permission. This change has significant implications for companies that rely on FUSE for macOS, as they will need to either pay for the commercial license or find alternative solutions. The maintainer's decision is reportedly due to the lack of financial benefits and the high maintenance costs of the project.