The King has gone broke.
Burger King hasn't been good since the early and mid-2000s...the 2010s and onward they've been on a downward spiral in terms of food quality.
Throughout the past decade, they've only had maybe 2-3 new menu additions that have been decent, and with the rise of many other burger spots (Culvers, Five Guys, Whataburger, IN-N-Out Smashburger, etc) and fast food chains like McDonald's and Wendy's staying relevant and innovative (hell Arby's even released a burger recently that's arguably better than anything on BK's menu), Burger King has failed to adapt to the times and desires of consumers.