Economics has nothing to do with the law.
This is considerably different with goods that aren't entirely digital. Even goods that are theoretically just data, like movies or regular games, still experience some manner of loss or decay. A digital product has zero disadvantages in getting it from some shady guy on a street corner versus the people who made it in the first place.
Let's replace "a shady guy on a street corner" with "steam" to avoid the obvious "virus'd" "not what you paid for" "not a legal copy" responses:
Steam still has downsides:
You lose internet due to a derecho (!?), freak thunderstorm, noreaster, tornado, hurricane, etc, but you have a generator, so you run your computer on it because you feel like it. Alas, you cannae get ye steam games from steam if they already weren't installed, and cannae run them if you don't have steam set up properly to do that (and some games don't allow it at all - Skyrim, I think, doesn't?) - unless your internet is miraculously working (my ISP is apparently lazy, as our internet keeps working when the power goes out for only a couple hours and then goes out, and they lol at phone calls during power outages complaining of lack of service, because they've never heard of generators before). Someday Valve may decide to sell Steam, and then who knows what happens next, or maybe Valve goes out of business because they invested too heavily in something which then fails - like, say, human civilization.
(Not that generators are good for the climate, but what are you gonna do when the government refuses to spend any money to improve the power infrastructure so this stuff can't happen anymore?)