Exactly, culture matters a great degree for creative work. If there were a big untapped reservoir of cultural input for tech firms being underutilized, it would be invested in. You see this a bit in secondary tech hubs like Boulder or Austin, which by dint of their history have some of whatever culture and skillsets the tech industry needs.

Big cities and metropolitan areas are generators of their flavor of culture, and that influences the kind of work objects that the local labor pool can produce.

Many of the cities on GP's list are actually major tech hubs (Tokyo, Sao Paulo, NYC, LA), and many of the other cities (Cairo, Mexico City, LA) are major creative centers for other industries especially media/entertainment industries for their respective spheres of orbit.