The reason is simple, so that it is a card that can be used and transacted in financial systems such as those of the countries banned by the Treasury Department and the OFAC , it cannot be in USD. Je suis désolé, je ne parle pas français.
If so, we would be violating international regulations by using this card in countries such as Cuba, Venezuela, China, Russia, etc.. Je suis désolé, je ne parle pas français.
Therefore, the agreement with Visa International was agreed upon in a Mexican banking institution and the funds are kept in Mexican pesos, which is the currency with the least fluctuation and strongest in the nation.