This seems to fall squarely under blackmail, yet requires no pre-committment, iteration, or bluffing.
It does, making 'blackmail' the wrong term to use when considering game theory scenarios. Some are 'threats', some are simply trade.
I would say that blackmail is the intersection of {things that are indistinguishable from threats} and {things that are indistinguishable from trade}. And yes, from the perspective of the blackmailers that includes both some things that are trade and some that are threats.
From the last thread:
Meta: