Probably didn't license their chips from Apple... 3rd party parts.. gotta watch them...
They can find a way to sneak it through the current generation, but if it doesn't have Apple's little tattle tail chip in there, then you'll be out the money come the next update.
I don't support Apple's little method of making sure that they get money for everything anyone sells, but knowing that it's there, you have to choose carefully what you buy.