http://loweringthebar.net/2018/06/plaintiffs-allege-forced-to-buy-cheeseless.html
tl;dr -
"And they are really not joking about this, you guys, because in addition to the usual consumer-fraud and unjust-enrichment claims, they have alleged that McDonald’s is breaking the law because “requiring” cheese to be bought along with a Quarter Pounder is an unlawful tying arrangement that violates the Sherman Act. “McDONALD’S forced and coerced members of the Nationwide Class to purchase and pay for the separate and distinct tied product, cheese, as a condition to purchasing the tying product, [the burger].” And the coup de grace: “McDONALD’s has sufficient economic and market power in the fast food quarter pound hamburger market to force consumers to purchase and pay for cheese … as a condition to purchasing [said hamburger].
Emphasis added yet again. I will agree it is hard to walk away from a Quarter Pounder, much less a Double Quarter Pounder. I just don’t agree that my inability to do so constitutes an unfair trade practice."