Bad for which economy? Countless programmers over the years have packed up their bags and moved away from their small towns to live in big expensive tech hubs. This has certainly been beneficial for the economy of large metros--they didn't pay to educate these workers and in many cases these workers (including myself) were raised and educated in completely different countries. So these metros have a huge pool of high…
The big metros are more efficient (dollar-wise) and have a lower environmental impact than small towns. Small towns, in the US, are already subsidized by big towns, at least economically.
As always through history, politicians and bankers plunder the country with taxes and interest. This wealth is then distributed by them, from the big cities, but that doesn't mean that the wealth originated there.