Calendar 2, an app that had a cryptocurrency-mining feature, was removed from the Mac App Store due to its violation of a specific App Store Guideline. Item 2.4.2 of the guideline states that an app’s design must allow it to efficiently use power, not drain the battery rapidly, produce too much heat, or cause unnecessary strain on the device’s resources – characteristics that Calendar 2 seemingly possessed.
Calendar 2 was created with the intent to serve as a better version of Apple’s current Calendar app. However, Qbix, Calendar 2’s developer, included a feature that gave users access to the app’s premium features in return for allowing the app to mine the Monero cryptocurrency. Issues were immediately seen upon the app’s use. For one, a bug made the miner continue mining even if a user has opted out of it. A Twitter user posted that the app “ate 200% CPU.”The option is activated in the “payment” option. The app was able to mine $2,000 worth of Monero in as little as three days.
ArsTechnica reported that Qbix included an xmr-stack miner that automatically runs the instance a user agrees to the app’s default terms. Users see a dialog box that show the CPU cycles the app dedicates itself to when mining virtual coins in exchange for premium features access. Customers have the option to pay a subscription rate or a one-time fee to gain access to the entire features. A free version of the app is available with no extras included.
Gregory Magarshak, the founder of Qbix, removed the app’s mining function due to problems in the miner’s source code. In a statement Magarshak released, he declared: “We have decided to REMOVE the miner in the app. The next version will remove the option to get free features via mining.” After negotiating with Apple and the removal of the app’s mining feature, Calendar 2 is currently available in the App Store.