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I don't believe you can, since Starbucks lets you use your card for any purchase. That said, even if you could, why restrict it? He mentions that the point of this is to be "an experiment in social sharing of physical goods", so making it something purely built on trust makes the experiment exciting and worthy. If someone does abuse it, then that's just a data point in the experiment; but, if it continues to be replenished, that's a neat observation and a certain +1 for human nature.



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