Consumer-facing financial services in Germany are really bad at this, and it is not just Sparkassen: a few years ago an email supposedly from our corporate credit card provider to all of the foreign nationals at our company asking for scans of their passport photo pages triggered a deluge of phishing reports to IT, who had to subsequently inform everyone that yes, the email did indeed look exactly like a phishing attempt, but no, it was real.

I don't really know why the situation is so terrible -- there are many good and competent security professionals working in corporates in Germany -- but perhaps as the post alludes to it is due to a lack of legal or regulatory pressure to date.