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

Apple recently reversed its long-standing ban on emulator apps like Delta, which allows users to play classic video games on their iPhones. This change, which made Delta the number one free iPhone app in the U.S., is believed to be due to increasing anti-monopoly pressures from various governments. Delta's success highlights both the potential and limitations of Apple's control over app availability, suggesting a shift towards more openness in the App Store could be beneficial for users seeking innovative and diverse app options.