Well that is one crappy coin holder! It makes no sense?
You’re right, it doesn’t make any sense. The likeliest use for it would seem to be temporary coin holding when counting coins before parking or preparing for a toll booth, but leaving coins in the open while parked or while driving/braking at higher speeds when the car shakes and moves around a lot seems risky. Audi has made far better coin holders for past vehicle models, this seems more of an after-thought, maybe for the blanking plate purpose.
