This stems from the fact that central banks targeted market segments that fell outside the traditional ambit of monetary policy, and that went well beyond the market for bank reserves, which is more familiar territory for central banks, and over which they tend to have more control.
Those systems could be said as a revolutionary business model that leads to credit card business, customer data management, and inventory management at present. Such tradition of making cutting-edge approaches toward industrial promotion and economic development has been handed down from generation to generation.