Apple bans cryptocurrency mining for iOS apps
No more shady crypto mining happening behind your back 🙏
Posted on June 12, 2018 12:07 AM.
AppleInsiderStephen Silver
Apple has added new language to its App Store review guidelines related to cryptocurrency. Under the Hardware Compatibility section, Apple now states that "apps, including any third party advertisements displayed within them, may not run unrelated background processes, such as cryptocurrency mining."
VentureBeatJeremy Horwitz
The upshot of the new rules is that while Apple will permit cryptocurrencies to exist on its platforms, it’s adding requirements to stop scammers and individuals from exploiting App Store customers, while making explicit that it’s blocking developers from eating Apple device processing power for mining activities.
Business InsiderKif Leswing
The iPhone isn't a great cryptocurrency miner, especially compared to special mining machines, but that doesn't mean that a surreptitious app couldn't mine tokens like Monero in the background. If enough people used that app, then that could add up to real money for the shady developer.
Despite sounding unlikely to happen, this very thing happened to an app called Calendar 2, which mined Monero from their customers' computers in exchange for free access to premium features.
AppleInsiderStephen Silver
But a bug caused the miner to run indefinitely. The app was pulled but reinstated days later.
In addition to the new rules, Apple published more information regarding their stance on cryptocurrencies.
AppleApple
“Apps may facilitate virtual currency storage, provided they are offered by developers enrolled as an organization. In addition, apps may not mine directly for cryptocurrencies, unless the mining is performed in the cloud or otherwise off-device. Apps may "facilitate transactions or transmissions of cryptocurrency on an approved exchange, provided they are offered by the exchange itself," although apps facilitating Initial Coin Offerings ("ICOs") must originate from "established banks, securities firms, futures commission merchants ("FCM"), or other approved financial institutions." And finally, cryptocurrency-related apps "may not offer currency for completing tasks, such as downloading other apps, encouraging other users to download, posting to social networks.

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Discussion
Ryan Hoover@rrhoover · Founder, Product Hunt
I get why Apple would ban this but it may prohibit legitimate use cases where mining on the phone makes sense.