Watch out! Milk is not always milk
Dark chocolate is basically always completely plant-based (i.e. vegan). ClearChox also has a growing number of vegan chocolate bars in its range.
Impressive video from Definite
Jens Kamin moved to the Dominican Republic and became a chocolate maker. The first real artisanal one in that country, which does produce cocoa and exports all the beans until then. Definite won awards and now there is also a very nice video