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Apple has updated the App Store guidelines to prevent all apps from supporting the cryptocurrency mining device. From now on, any app that includes the crypto-fetch extraction feature will be removed from the store and no new sign-ups will be accepted.
The new rule, recently added, states that "applications can not extract cryptographic events unless processing is performed from the device." In addition, "apps, including third-party ads running on them, can not trigger unrelated backgrounds, such as crypto-mining."