There are already more software devs in NYC than in Silicon Valley. There's also triple the amount of people in the NYC metro area, and a lot of other industries. I'm not sure NYC needed to give a lot of money to attract them. It isn't like NYC is some former steel town or something looking to bootstrap an industry. On the contrary, NYC has added 375k people to its population in the last 10 years which is about 40% of the SF total population.

NYC also has a Gross metropolitan product 3.5x the bay area. I think Silicon Valley would like to be the NYC of the west.