Unbalanced?
From the picture, if the left-hand portion containing the SIM is removed then the remainder is square in proportion and therefore balanced.
Moments of inertia are funny things, which is why real engineers usually get a technician to spin things around and see if they fly apart rather than doing reams of painful maths (and anyway, it's much more entertaining). Equal weights at 12, 3, 4, 8 and 9 o'clock would be *dynamically* balanced, even although they obviously aren't *statically* balanced.
None of which changes the fact that it's a stupid gimmick. As, come to think of it, are penny-in-the-slot optical drives. At least with a traditional tray-loader, you don't have to wear gloves in order not to get fingerprints on the working surface of the disc .....