It is difficult to definitively determine if Yearn is a DAO or not, as the concept of a DAO is still relatively new and evolving. However, it appears that Yearn is not a DAO, as it is a centralized organization with a team of developers and other personnel, and does not have a decentralized governance structure. However, it is possible that Yearn could eventually become a DAO, as it is currently working on two projects, vl-ycrv and veYFI, which could introduce a decentralized governance structure. It is also possible that Yearn could remain a centralized organization, and simply use the projects to expand its offerings and capabilities. Ultimately, only time will tell if Yearn will become a DAO or not.