It's based on the exchange rate of either USD or Yen to whatever currency you use however these numbers are frequently not updated very often to keep prices stable so you don't buy SQ one day only to find them substantially cheaper the next as a result they may have estimated where the exchange rate is going to be in x period of time to determine the pricing.
At least this would be the standard reason for such things and I see no reason it wouldn't apply to FGO. Contacting staff would almost certainly not get an answer though as companies usually like to keep this kind of thing hidden unless a large fan outcry occurs also support staff frequently just won't be in the loop for this kind of thing, doesn't hurt to try though?
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