Apple banned this app for years. It’s now America’s No. 1 iPhone app.

The hottest iPhone app in America may owe its popularity to government crackdowns on Apple.

That app, Delta, lets you play old-school video games like “Super Mario Bros.” on an iPhone.

Apple had banned apps like it for years but un-banned them this month without much explanation. Delta’s creators say growing anti-monopoly pressures were responsible for Apple’s flip-flop.