In a recent update, the personal computing company expanded its initial guidelines on cryptocurrencies. But the company later pulled the app, reportedly because the software's mining function could drain a Mac's battery life and cause excessive heat.
Aside from banning crypto mining on its devices, Apple also outlined the general use of cryptocurrencies.
Instead, the language seems to suggest Apple is cracking down on background processes running within an app, like an ad or script.
In addition, Apple is giving its full support to cryptocurrency wallet apps, as long as they are "offered by developers enrolled as an organization".
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Apple previously declared that apps transmitting approved cryptocurrencies had to do so in compliance with applicable laws.
Apple has updated its App Store guidelines to disallow all apps from supporting on-device cryptocurrency mining.
Background cryptocurrency mining processes which operate without user knowledge and without restriction can result in performance degradation and potentially lead to hardware problems if a device's components are being continually overworked - which, in turn, can be problematic for vendors. The only exception is for "cloud-based mining", in which the virtual currencies are remotely generated off the Apple product.
Apple updated its App Store review guidelines last week, during the WWDC 2018 conference. The new feature reports back to the user how much time is being spent on the phone and even allows a time limit to be set when the app will lock down the phone, of course, there is a snooze option which allows a few more minutes of cheat time. Apple may have already had to face devices damaged by mining, which is probably why the company chose to act so strictly on the matter.