If you notice, the board is centred in european Russia, and it’s the obvious choice since main action was that front. Also, this way Pacific and Atlantic are also not cutted in zones where action is supposed to happen so it’s the logical choice
Usually world maps are centered in the country for the map is done (USA’s ones center in America, spanish or french ones in western Europe and japanese ones in Japan). I heard of some middle age maps form muslim countries centered in Arabia and oriented to south instead the traditional north, go figure :lol:
But none of those proyections are OK for Axis and Allies. I think that in this point, the map, the designers made the best option possible centering it in european Russia :-)