One can find a lot of words to describe this lifestyle, but I think one that fits the most is "parasite". And as most healthy organisms, a modern city in a mode

One can find a lot of words to describe this lifestyle, but I think one that fits the most is "parasite". And as most healthy organisms, a modern city in a modern society can tolerate a number of parasites, and they may not even do any harm when they're in small quantities. But if it spreads beyond certain measure, the lives of both the host and the parasites become very miserable.