The evolution of vending machine interfaces is highly curious. Seen in Amsterdam yesterday, at the train station in Schiphol. This train ticket machine sports weird spikes. What do they mean? What are they intended to do? preventing people to put stickers? Or it can be a way to prevent credit card skimming (the practice of retrieving and using the information that is encoded on the magnetic strip of a legitimate credit card).

The way they are place on the interface is very odd. Any clue?