Effectively, securitization can significantly lower the cost of extending home loans, and some of those cost savings can be passed along to homeowners in the form of lower mortgage rates. It seems clear that the housing government-sponsored enterprises (or agencies) played an important role in the development of mortgage securitization in the United States.
What is true is that Monopoly shows what can happen if markets are left entirely to their own devices. Once all other players have been eliminated, Monopoly is over, and with it the fun. In the real world, the actual monopoly status would be just the beginning.