This triggers immediate interest charges (no grace period) and a cash advance fee (often 5% or $10 minimum).
Their "Rewards Abuse Team" (RAT) may claw back points if they detect you are buying gift cards specifically to meet a spending threshold.
Are you looking to buy a gift card for a , or are you trying to meet a specific spending goal ?
: Per Amex's official terms, purchases of gift cards or other "cash equivalents" are not eligible to earn Membership Rewards points or cash back.