It's common in France to ask for a free jug of water with your meal. Of course the restaurant owners would prefer to sell a high margin bottle of wine, but they won't cry over the internet for the few customers who don't spend enough on beverages.
Worth noting that it has been created mostly to bypass the monopoly of Anish Kapoor, who negocited the exclusivity of the use of Vantablack in art. Besides the producer explicitly says that anyone can buy it except Anish Kapoor :-D
I don't know where his french friend has seen mustard pizza (https://www.instagram.com/p/Bl5gTduDw9c/), but in France one the traditionnal recipe for tomato pie calls for a layer of strong mustard (Dijon) under the tomatoes. The combination works well.
They haven't made much research, they're far from being the first to do this. In France some brewers already cook this kind of thing ("confit de bière") since quite a few years. The recipe is basic and well-known, and is probably used in many other countries.
About point 6 : the real name of the system was "Minitel", not mintier. You can read more about it here : http://en.wikipedia.org/wiki/Minitel . It had been exported to several countries (including USA), but without the same success as in France.
This theory is explained (among other fine little gems of knowledge) in "1491", a very interesting book by Charles C. Mann. Plagues played a very big role in the conquest of America, not only in current USA but also in Inca and Aztec empires.
"Dark Vador" is the name that was used in the first french releases of the saga, and it's still more popular than "Darth Vader", that's why they used it.