title: Is DeviceCheck or indentifierForVendor safe?
body: <p>I am planning on using <code>DeviceCheck</code>or <code>indentifierForVendor</code> to ensure that the same device is not being used to redeem multiple times the same gift (free money for example sake) offered to new users. I am wondering however, if it is possible to trick this system on a jailbroken device? Or using a custom simulator or a botnet (do iOS botnets exist?)?</p>