In partnership with Synchrony Bank, the "Amazon Prime Store Card Credit Builder" lets people put down a refundable security deposit (yes, like an apartment), which will be used to set the card's total credit limit.
The $80,000 is fully refundable, should applicants find themselves unable to rise to the full $9.
Second, the pre-orders are not just cancellable; the deposits that accompany them are also refundable.