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

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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.