The opposite of what's being alleged. From TFA:

Broadly, the interlocking restraints set and maintained by the defendants have forced merchants that accept any Visa and Mastercard credit card to accept all such cards, regardless of cost, thereby eliminating any incentive for issuing banks to compete by lowering their fees, the suit says. The lawsuit claims the challenged restraints have also prevented merchants from being able to steer customers to lower-cost payment options—for instance, by surcharging based on a customer’s use of a particular card. These and other restraints have prevented competition among issuing banks and other credit card networks, allowing the financial giants to raise their fees every year “without consequence,” the case alleges.