If Anticorporatistan enacts a law that Big Evil Co., Inc. thinks might somehow limit its ability to make a profit, Big Evil Co., Inc. can sue Anticorporatistan for the profits it thinks, at its sole discretion, it would lose because of the new law.
With Anticorporatistan being the United States, and laws they don't like being the existing Fair Use protections. It's not a vague future hypothetical.
They don't like fair use, but it is not clear fair use protections could be legislated away without a court overturning any such clause with a first amendment argument. If that were to happen, foreign corporations could sue the US for damages, and win, but no other legal remedy would be available -- they could not stop the fair use from continuing. Maybe they could sue again the following year.