I discovered a perfect usecase for blink vouchers which is tipping housekeeping at check out of a hotel. Since you usually don‘t meet the guys in person you have to use something that is not cash (fiat), doesn’t require them to leave their QR-Code somewhere somehow which might get them into trouble and is still disposable. (Giftcards/Boltcards wouldn’t therefore be a good alternative). A small disposable piece of paper is ideal.