People working out of offices in Indian cities are not criminals since they work for legitimate businesses; the concentration of scam operations in said cities is not related to the presence of the IT industry, nor would scammers allocate resources inefficiently by buying office space, which isn’t required to run a criminal enterprise and may be detrimental by way of drawing attention and scrutiny which would have been avoided otherwise.

(Downvoters may want to address the problems with my comment; although I feel this is an issue which people feel strongly about, so a rational analysis is often foregone in the pursuit of vindication.)