Excellent question. It is hard to believe that only now did Amazon start caring so much about its already tarnished public image with worker rights and whatnot that they'd roll over so quickly on such a huge deal. I surmise that it was the mayor's office that called off their part of the deal, based on the public statements. The governor had been lacing into the recalcitrant lawmakers who joined the protestors. Both are rumored to want a 2020 Whitehouse run, but the mayor also has a much more public reputation as a "progressive" to defend. This is just my speculating.