To which some will reply that the DOJ’s lawsuit isn’t about competition in the credit card space, rather it’s about Visa’s alleged abuse of its supposedly “dominant” position in the debit card market. True enough, yet it speaks to the relevancy of “We don’t take American Express.”

The Justice Department is accusing Visa of running a debit card monopoly that has hiked fees for American consumers and businesses.

The U.S. Justice Department has filed an antitrust lawsuit against Visa, alleging that the financial services behemoth uses its size and dominance to stifle competition in the debit card market