I don't see why its presumed to be USD specifically. Could be any sort of Dollar, arguably. As far as I know, there are more than ten countries using some sort

I don't see why its presumed to be USD specifically. Could be any sort of Dollar, arguably. As far as I know, there are more than ten countries using some sort of "Dollar" which uses the same symbol ("$") for their currency. But yeah, probably safe to assume USD, just playing devils advocate I guess. Even so, on US-based platforms, like reddit or HN, USD is usually used as a "convertion unit" rather than a implication of location, I've found.