Cool initiative. IIUC it lowers the cost of asking for and vetting help, which can be substantial. Moving a project to a stewarding entity even more so -- actually I imagine easily matching/getting new maintainers on board could ease eventually moving to a stewarding entity, eg Software Freedom Conservancy (which I volunteer for) requires accepted projects to have multiple maintainers from multiple organizations https://sfconservancy.org/projects/apply/ which is a giant leap for an unmaintained project. I believe other ~foundations also have extensive onboarding procedures/requirements.