The OpenStreetMap wiki can help for such questions: https://wiki.openstreetmap.org/wiki/Key:button_operated says "[it] means rather "there is a button that may activate something or do nothing at all" rather that it was confirmed that pressing button certainly has some effect."

There are also button-like devices in Germany which I'm not even sure are buttons to begin with, but in your picture (thanks for adding!) it says "bitte berühren" so it's definitely pushable. May not do anything during peak hours or in its current configuration, but that's beyond the scope of the OpenStreetMap tag: the button exists and that's what the tag indicates