The bidders are also free to mention to Amazon that they were thinking of increasing the funding for their local anti-trust investigations, and maybe those funds wouldn't be available if they had to be spent on infrastructure improvements related to significant new construction in the area instead.

Ask for a bribe; get a threat. If a city can afford to blow a few million on tax breaks to get more millions in economic development, it can afford to blow a few hundred thousand on lawyers to get something in fines or settlements.