It's more than a little unfortunate to see the franchise head for the abyss, as the Tap Tap games are not only an App Store classic, but a bright piece of iOS history, too. The original game, Tap Tap Revolution, was one of the earliest titles for the iPhone. It was released on September 11, 2007, less than two months after the original iPhone shipped, and about ten months before the App Store launched. Thus, the game had to be downloaded from the blog of its developer, Nate True, and required a jailbroken device to be installed and played.
Later, its creator was hired by the gaming startup Tapulous, and a revamped version, Tap Tap Revenge, became an App Store launch title in June 2008. The free game amassed more than a million players in less than a month. In the years after, Tap Tap Revenge had four official sequels, and a ton of artist-centric spin-offs, which began with Nine Inch Nails Revenge, and ended with Born This Way Revenge, based on Lady Gaga's second album of the same name. In 2010, the Tap Tap games had collectively amassed over tens of millions of downloads.
Since 2010, Tapulous is a wholly owned subsidiary of Disney Interactive Media Group. The Tap Tap games, or at least what's left of them, shall be the last remnant of its independent years.