Sandbox is a great model that enforces collaboration and cloud native ecosystem growth. But it feels that the main CNCF goal of "fostering a community around a constellation of high-quality projects" in a way contradicts the current sandbox rule - "CNCF Sandbox projects can stay in the sandbox indefinitely". Indefinite membership - even with limited CNCF investment - is not sustainable without raising a quality bar at the acceptance level and beyond. Also the reasons why the sandbox candidate is found technically interesting/innovative, what advantages it has over similar projects (having a great community qualifies too) or/and why it is considered to be a high risk, can be delivered to the CNCF community with more clarify to reduce the chances of kingmaking blame