Startup Cities vs Charter Cities?

The nomenclature is always kind of changing and it's sort of been this endless problem in the space of the shifting term. But generally speaking, where I draw the line is that a charter city focuses on having a charter with some host government such that they are getting some differentiating law or governance aspect inside the city. Now, what I focus on and what I term startup cities are simply cities or neighborhoods built by startups,. actually run as a product like run by run by startups.