As predicted, American Express Gift Cards have returned to cash back portals. Here are the current rates as shown on CashBackMonitor:
No sign yet of gift cards on mileage or bank portals though. In the recent past we’ve been able to earn Delta SkyMiles and Alaska Airlines MileagePlan miles when buying Amex gift cards. A bit further back, Amex gift cards were available through Barclaycard’s RewardsBoost Portal.
For more about Amex gift cards, please see: Everything you ever wanted to know about Amex gift cards.