Big Tech's upside from the Supreme Court Amex ruling

The Supreme Court
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The Supreme Court upheld Monday a lower court ruling that American Express didn't violate federal antitrust laws when it told retailers that took Amex that they couldn't encourage customers to use cards, like Discover, that charge merchants lower fees.

Why it matters: Today's decision may give the tech giants more ammunition to argue against the growing number of critics who believe their power is an competitive concern. Amazon, Facebook, Google and Uber — like American Express — run two-sided markets. The court said, effectively, that antitrust cases against two-sided market companies should sometimes have to consider both sides.