From the beginning of the 21st century, historians will remember a profound change in the economy: the 'digital revolution', where the dominant economic players no longer come from the fields of Energy or Industry, but the famous GAFA (Google, Apple, Facebook, Amazon) in Western countries and BAT (Baidu, Alibaba, Tencent) in China. This revolution is of the same magnitude as the industrial revolutions of the nineteenth century, or the invention o...