Apple has yet to block a popular title in the Mac App Store that has openly embraced coin mining, prompting one to ask the question: does Apple allow apps in the Mac App Store if they clearly disclose that they will be mining cryptocurrency? Ars Technica reports: The app is Calendar 2, a scheduling app that aims to include more features than the Calendar app that Apple bundles with macOS. In recent days, Calendar 2 developer Qbix endowed it with code that mines the digital coin known as Monero. The xmr-stack miner isn't supposed to run unless users specifically approve it in a dialog that says the mining will be in exchange for turning on a set of premium features. If users approve the arrangement, the miner will then run. Users can bypass this default action by selecting an option to keep the premium features turned off or to pay a fee to turn on the premium features. If Calendar 2 isn't the first known app offered in Apple's official and highly exclusive App Store to do currency mining, it's one of the very few.