Note that American Express (USA) has refreshed new account terms to itemize behavior which may cause rewards to be forfeited:
... points will be credited to your Membership Rewards account 8-12 weeks after you have met the purchase requirement. If we in our sole discretion determine that you have engaged in abuse, misuse, or gaming in connection with the welcome bonus offer in any way or that you intend to do so (for example, if you applied for one or more cards to obtain a welcome bonus offer (s) that we did not intend for you; if you cancel or downgrade your account within 12 months after acquiring it; or if you cancel or return purchases you made to meet the Threshold Amount), we may not credit Membership Rewards to, we may freeze Membership Rewards credited to, or we may take away Membership Rewards from your account. We may also cancel this Card account and other Card accounts you may have with us.
American Express reserves the right to modify or revoke offer at any time.
Your account must be in good standing and not in default at the time of fulfillment of any offers.
*Qualifying purchases are purchases for goods and services. Qualifying purchases do NOT include fees or interest charges, purchases of travelers checks, purchases or reloading of prepaid cards, purchases of gift cards; person-to-person payments, or purchases of other cash equivalents. Additional terms and restrictions apply.