What irked me the most in that post is that dude clearly knew he didn't pay $12 initially but tried to hide this fact.

As for forex, at least he's actually from Turkey. People around the world have been abusing Turkey currency exchange rate for these online service fees for years (Google and Steam are notable ones, but there are quite a few others like Spotify, Netflix..).

I don't know the technicality about this, but most, if not all, of these non-financial companies seem can only update their exchange rate once in a while (not to mention there is also regional pricing involved). So as soon as some violent exchange rate change happens, there are often days or even months to grab some sweet discounts by simply switching currency.