American Express has steadily increased new Platinum Card accounts in the U.S. since 2017 when the premium credit product was refreshed with new benefits and features. That refresh, which was designed to answer challenges from premium cards promoted by other issuers, was more successful than Amex anticipated. Last month, American Express began promoting a new round of Platinum Card benefits valued at $1,400. Some focus on spending tied to lifestyle and were influenced by consumer behavior in response to the Covid-19 pandemic when cardholders where required to spend more time at home. New be...