American Express Co AXP has announced significant upgrades to its U.S. Platinum cards, adding new perks worth over $3,500 annually while increasing the annual fee by $200.Amex Revamps Platinum Perks, Raises Annual Fee to $895The updated perks will feature credits for dining via Resy, shopping at Lululemon LULU, and Uber One memberships, along with enhanced hotel and entertainment benefits, reported Reuters. Platinum Business cardholders will gain new credits for Dell DELL and Adobe purchases ADBE, a $600 ho ...