Did you actually look at that list? Most have under 1,000,000 in population. Many even have less than 100,000. There are only a handful of cities on the list comparable to NYC. It’s also worth noting that Manhattan would be 9 on the list, if listed as an individual city. The current number 9 is Port au Prince. Is that the kind of metropolis you were comparing NYC to?
https://en.wikipedia.org/wiki/List_of_cities_proper_by_popul...