The primary use of this map is an attractive display map with the unusual upside-down orientation. However, the map is also loaded with useful geographic information.
The style of this map is produced like an old-fashioned or antique map. It uses many shades of brown and gray, and the colors of countries appear desaturated and faded. The oceans are a soft brown/tan and the paper will appear to be worn out (though the map is printed on new, high quality, and durable paper).
This antique style of the upside down world map provides an aura of sophistication and charm and makes a very aesthetic map for display. Business customers, especially, prefer the antique styling of the map as it appears very professional.
An upside down map will give you and other viewers a chance to see the world from a completely different perspective.
Many of our perceptions of the world come from the standard (though arbitrary) north-up orientation. By flipping the orientation to south-up, it's as if you'll be viewing the world map for the first time. Shapes will seem strange, the layout unfamiliar, and even the proximity of areas may startle you.
An upside down map, especially world map, can teach us a lot about the importance of our point of view, and how our perspective shapes our perceptions of reality.