I suspect they aren’t doing this (just) to avoid fees - it’s more about national security in a world where the US might stop being a reliable ally, and in a world where the US has used withdrawing Visa / Mastercard as a strategy to weaken enemy economies.
I think the recent stories of the International Criminal Court judge being forbidden to use VISA and Mastercard, making his life somewhat more challenging, did make some politicians aware of the risks.
https://en.wikipedia.org/wiki/Nicolas_Guillou