The App Store hasn't had any shortage of knockoff apps since its creation a few years ago. When popular games such as Angry Birds or Cut the Rope make their way up the charts, you can expect a few unscrupulous developers to rush and try to get their copycat app approved and available in the App Store in order to make a quick buck.
Surfing on the popularity of Cydia, the App Store for jailbreak apps and tweaks, one shady developer thought that releasing an app called Cydia and making it available to over 300 million iDevices (no jailbreak required, mind you) would be a good idea...