The governance of a pure community project are those rules and practices that the project has given itself, implicitly or explicitly, as practiced by the members of the community.
The governance of a foundation-hosted project are those rules and practices defined by the foundation, possibly enhanced by additional informal rules and practices of the specific project.
A corporate foundation-hosted project has added to the general governance required by the foundation its own formally structured and recognized governance; it has been written down and is formally supported and hence legally actionable.
The CNCF provides added formal governance rules and practices to its projects like Kubernetes, thereby extending and refining the general governance of the LF for its corporate foundation-hosted projects.