Does this count as piracy? Probably. I think they even have platform-free redownloads. I can't be arsed. I've paid for it. When I want it in a different version, I'll get it from the most convenient distribution channel that happens to be the pirate bay.
I also own like 4 Windows 7 licenses. But my Windows 7 computer is running a pirated version because: 1. I lost 2 of the license keys (the sticker at the bottom of the laptops burned out from heat). So much for that. I liked my home-premium install, too. But that's a non starter because the keys can't be recovered. I'm supposed to write down keys in case of this problem? What is this? 1999?
2. There are numerous version incompatibilities. 2 of my Windows 7 licenses are "academic versions" of Windows 7 unlimited because they ran some promo when it first launched that I bought. Apparently, despite being Unlimited, if you get the ISO off the pirate bay for the unlimited version, it doesn't work unless you have the academic version of the ISO. I have no idea how to get the academic version of the ISO, because the ISO downloader on MSDN academic is a Windows-only program. (At the time I had no Windows computers --- I was trying to get my first Windows 7 install up!). SO I got the same ISO from the pirate bay (the only place to get hassle-free ISOs). It's important to note that I have Unlimited-edition licenses. It's not failing because I paid for Home-premium and am trying to run Unlimited. This is different versions of Unlimited. It makes my ears bleed just how many different incompatible versions there are.
It's just a confusing mess. I'm sure I count under the piracy statistics as a pirate user. But in reality, I have 3 computers, two of which have Windows 7 installs, both "pirated". The fact that I own 4 licenses, none of which I could manage to get activated, won't come up on the statistics, will it?
It'll be interesting to watch the evolution of game distribution. Xbox and iOS are massively growing platforms that also bring built-in DRM that's significantly harder to circumvent.