QR code practices in Zürich

Some examples of QR code usage in Zürich, Switzerland (meeting there today). First, you have the formal version... an advertisement for the NZZ (swiss newspaper): Giant QR code in Zurich Hauptbahnhof

Then some more street-oriented practices also take advantage of QRcodes with the nice duct-tape touch:

Duct-taped QR code

I am however skeptical about the real usage of this QR code, which seems rather aesthetic/trendy that meant to foster specific interactions. It would be curious to know whether people use them, any clue about it Roger?