Steam suggests currency conversion when you post a software. It’s up to the devs to accept it, but they generally do as they can’t spend a team to research about each market and see what brings better profit.
And just to remind, it’s not as simple as “hey, it costs less there!”. For an example here in brazil it costs 4 times more compared to our wages. It’s being sold for half the price compared to the US. This means, IMC is getting less money (not really because they are selling much more) at the same time it’s a big hit for brazilians money.