Piracy and copyright violation are not the same thing (though they may overlap).

Claiming somebody else's work as your own is depriving them of their rightful reputation for creating the work, and any profit you make from hijacking their creativity is fraud - you are conning the person who pays you for the work, and may or may not be depriving the artist of the money from the sale as well, since it seems likely that if someone was willing to pay you for the art, they would have been willing to pay the actual artist as well, assuming he or she would have been willing to agree to the same terms.

Generally speaking, software pirates do not claim to have created the works they are distributing. And as long as they aren't charging for it then they are not demonstrably depriving the creator of any revenue, since those that download it may well have been unwilling to pay (if they would have been willing to pay had a pirate copy been unavailable, then the decision to pirate instead rests on their conscience, not the distributor's).

Claiming work as your own, and charging for it without making it clear that you are not ethically entitled to profit from it are both fraudulent and immoral activities (As well as being illegal). Distributing a work that is hard to obtain otherwise (for reasons of scarcity or cost) is not fraudulent as long as you make it clear that's what you are doing (it is of course still illegal, unfortunately).

What you are distributing doesn't matter. The same would be true with any medium for creativity, whether it is spoken, written, recorded, painted or programmed.