They exchange the gift cards for lower than their value to whatever platform the cards are for, there’s plenty of people that would want to pay, say, £20 for a £30 steam voucher card, from the buyer’s perspective it’s a great deal, they basically just get an extra £10 to spend on games, and the scammer, who got the £30 voucher for free, makes £20 selling it on. So the scammer makes £20, the buyer gets an extra £10, and obviously the person who got scammed just looses £30.
As a side note, this is often why certain online key resellers for steam or other platforms tend to be considered a bit shady. In theory the games on there shouldn’t have been bought fraudulently, but they could be used in the same way as how people sell the cards. Rather than selling the card for £20 to someone, they just buy a £30 game themselves on steam and sell it on one of these sites for £20
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