Zoning laws don't come out of nowhere. People like living in suburbs, so their governments pass zoning laws that keep the area suburban.

Zoning laws are an expression of preferences by the existing homeowners who want their neighborhoods to retain their current characteristics.

Look at the history of how this happened. The suburbs did not magically appear out of nowhere after WWII against the wishes of the population, and they were not legalized into existence with zoning laws. They were built, people liked them and bought houses in them, and then they passed zoning laws to keep them.