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After charger, Apple removes USB-C cable from the box
(www.gizmochina.com)
This is a most excellent place for technology news and articles.
And USB-C cables aren't universal, I imagine a bunch of the cables you have can't handle the higher voltage charging Macbooks have. But if your cable is capable of a higher standard, it'll work fine with anything below it (e.g. I use my Macbook Pro charger to charge my Android phone, keyboard, and mouse all the time).