Computerworld - https://www.computerworld.com/article/3281367/blockchain/apple-bans-cryptocurrency-mining-apps-on-ios-to-protect-mobile-users.html#tk.rss_all
Using an iPad or iPhone to mine bitcoin or other cryptocurrencies would be hard to do, as the CPU power available to complete the task would be a drop in the bucket compared to what’s needed.
But using a portion of the CPU power from thousands of iPads or iPhones to mine cryptocurrency makes more sense – and that’s exactly what some malware has been doing.
Apple is now moving to stop the practice.
[ Further reading: The way blockchain-based cryptocurrencies are governed could soon change ]