Given that Apple rendered MAC addresses useless for tracking users in iOS 8, and make developers swear up and down that they're only going to use IDFA for advertising, I think they're a bad example to start with.
Oh, so to stop location tracking, not identification by app developers? I interpreted the GP as meaning that apps somehow couldn't use the mac for id purposes. Thanks.
Both are correct (unrelated). MAC address is randomized when scanning for wifi networks, and if you ask iOS for the device MAC address, the SDK will return a fake MAC.