Why did GT sign on the god damned dotted line?
Perhaps because of said "bait-and-switch" tactics?
Doubtless Apple assured GT they would definitely buy all that sapphire; why else would they invest so much in producing it? Even though the contract technically allowed them to back out, there was surely very little chance that would actually happen, and a far greater chance of massive revenue from being a key supplier for the next iPhone...
Then it turns out that the product wasn't as shatter-resistant as they'd hoped, and they backed out, or whatever. But who could've guessed that Apple might go back on its (non-binding) commitments? Tim pinky-swore!