I watched Ultimate Airport Dubai last year and it was mentioned how a big problem it is for Emirates. Especially in premium cabins
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They could be moved to a "new" account and then redeemed for eGift Cards.
The article gives a pretty extreme example, it would be pretty rare that someone travels with that much money on them. I would almost be willing to bet that the pax was specifically targeted well before they got to the airport rather than simply picked at random.
At 1 pax in 1,000,000 that puts it into the extremely unlikely basket. Yes it is a risk, but so is stepping outside my house.