Anonymous participant Please understand that embassies/consults of a country can ask for any document they want beyond the minimum published. It is the same throughout the world for every country.
there is nothing arbitrary. Every embassy/consulate of any country in the world has absolute power to deny a visa and nobody can do anything except post their grievances on FB.
Embassies and consulates can ask anything they want. They don't have to give any reason for their demand. It is the same throughout the world for any type of visa. The requirement is the minimum and only a guide.
Whatever they use it, they've asked for and must provide. Why do you care? Are you trying to avoid taxes or trying to cheat your way? If none of that, nothing to worry.