I agree that tax breaks for non-profits net benefit the public, but I also can see how a non-profit hording tens of billions in savings might not be in the publ

I agree that tax breaks for non-profits net benefit the public, but I also can see how a non-profit hording tens of billions in savings might not be in the public's interest and arguably is a form of profit. Perhaps the definition of 'non-profit' for tax purposes needs to include a provision limiting these essentially retained earnings that are not invested in the organization's mission. Does anyone know more about the accounting and tax details?