AmEx began making acquisitions in the dining and event space with its purchase of Resy five years ago, giving cardmembers access to hard-to-get restaurants and locations. Other credit card issues have done the same.AmEx’s purchase of Resy five years ago raised a lot of eyebrows in both the credit card and dining industries, but it’s become a key part of how the company locks in high-end businesses to be either AmEx-exclusive merchants, or ones that give preferential treatment to AmEx cardmembers. Are acquisitions and mergers the new business models

