Interesting. They have this in their "Content policy" document (in the enumeration under the "Content Models" heading:
..content that is prohibited and will be removed (public or private):
6.Content that resembles weapons or weapon accessories (exceptions are made for miniatures, max size 10cm)
In the past they have cited some Dutch law limiting production of
weaponry and look-alikes - perhaps they have since received clarification from their lawyers that this is restricted to guns ?