Flappy Bird On A Point Of Sale Terminal

Can you think of any GOOD reason why playing some arbitrary game on a point of sale terminal should even be possible? Why does the device have that capability? It may be cheaper to build out of mass produced computer equipment capable of doing anything than specially built electronics that can only do limited things, but if cost is the reason then we're basically just whoring out the security of our data for the price of those cost savings.

(Thanks to Mikko Hypponen for bringing this video to my attention)