<https://arstechnica.com/information-technology/2018/03/theres-a-currency-miner-in-the-mac-app-store-and-apple-seems-ok-with-it/>: 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. But there were one or two bugs that kept things from working smoothly. However, in an update to the article, it seems the developer has had second thoughts, and is removing the miner function from the app.