In this articleTGTAMZNAn Amazon driver delivers packages in Washington, D.C., on Aug. 27, 2023.Tom Williams | Cq-roll Call, Inc. | Getty ImagesWhen Brandon Fishman ran a discount on his vitamin-infused coffee for Target's weeklong deals event, he wasn't worried about how it would affect his business on Amazon. He certainly didn't expect his sales there to "fall off a cliff."Fishman was in for a rude surprise. During Target's sales event this week, Amazon's automated systems detected his bag of VitaCup coffe ...