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At this point it's clear that the card can be abused as there are people who for some reason think it's cool to suck the balance completely dry.

However, a company like Starbucks could set something up that is very similar to Jonathan's experiment but with a reduced abuse potential: just introduce a card with a limit per transaction. For example, if you could only charge 6 USD per purchase to the card, it would make life difficult for the cheaters.

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