Someone has to absorb the fees if they do this–either the client in question (Steam), the devs or, sadly, the customer. Once it doesn’t become viable for them (turn a profit) they axe it. GOG had it for a long time, but it couldn’t be maintained, and they had to get rid of it. The same thing will happen with Epic. That 12% cut is not and never was sustainable and it was proven on twitter when Sergey Galyonkin started talking about how adding more payment methods was too costly for them and they would have to start charging you, the customer, to sustain everything. Makes you realize that price cut on their games wasn’t the straight up fairy magic they tried to make out to be. 
(also, don’t want it to come off that I don’t agree with you that it isn’t fair for other countries in this situation, just trying to put it out there why these companies don’t offer these options (at least for long) and whatnot)