I still can't fathom how monetizing what are basically just shared network drives, a feature already built into windows, is a successful venture. Hire an IT gu

I still can't fathom how monetizing what are basically just shared network drives, a feature already built into windows, is a successful venture. Hire an IT guy and have him setup network shares, done. But obviously there seems to be some need I'm overlooking, considering the revenue these companies are making.