Throughout American history, politicians have incessantly awarded preferential policies (e.g., “corporate welfare”) to special interests that has allowed them to create monopolies dominating virtually every major market.
In their war on "monopolies," Progressives like Elizabeth Warren show they don't understand the history of anti-monopoly legislation, and they also don't understand that modern day "monopolies" aren't really monopolies at all.
Since public schools are funded through tax dollars, the schools don't really care if their safety measures are done in a way that treats students with the sort of respect paying customers would likely receive.
Private cities may seem outrageously radical or utopian, but we are already using this approach very successfully in other areas of our lives. The transfer to our social order is only the last step in a development already under way.