Not everywhere. In some parts of the world, you can pirate for personal use. Some restrict what you are allowed to pirate legally, but it is out there, and there are groups trying to legalize it in other countries as well.

As for the topic at hand / My two cents:

As said earlier, you will never win against piracy, there are a magnitude of reasons people pirate; from games not being released in their region, not having money to buy, wanting to "try a game first", getting a uncensored version (ie. Aussies get screwed a lot by that), because they can, ect, ect.

I do commend GoG for what they're doing and how they're going about it. DRM-Free is actually a really good method of doing things. I've had friends who bought games, then pirated them (the ones they bought) because of DRM issues. DRM doesn't bother pirates, it just screws over consumers. Remove the DRM, you remove the reason -some- people pirate. A lot of pirates, not all, do have respect for that type of model, and this site. Which can contribute to why there are less using this than the disc.

As for the disc part, that can also be contributed by the Scene groups who crack those discs. Why? Scene groups are like collectibles to some pirates, they like to grab all of there releases like they're some rarity, so even if there are other versions, they still grab that. Heck, they still would if the cracked version was so broken it was unplayable, to some of them that is like finding a double headed coin. I have known people who try to collect every release from a group they can like a bad habit.

I actually think because of some company practices it will be worse for some games than others. Witcher 2 for example, I bought the boxed version because I thought how much they offered for the price was brilliant, and it made me get it over the Steam version in a heartbeat. Free DLC? Heck yea, that is a deal I can easily support. Now look at games from other companies. On average now you'll pay around $60 for a new game, then another $10-60 (or more) on DLC, including a lot of crap like clothing and other useless stuff that should have been there from the get-go, or added for free. On a lot of pirates eyes, that is like a big neon sign saying "Pirate me", because the companies are getting greedier and also adding nastier DRM to drive more people to want to pirate and not buy. So that constant screw-over shows a huge lack of respect to customers and will most likely end up having more people pirate.

So pretty much the actions they took with Witcher 2, and GoG in general (CD Projekt RED), is one of the better ways of combating piracy. Not lawsuits or other crap that just adds a minor distraction, but actually showing you care about your customers and trying to cater to them and not just your wallet. It won't kill piracy, but it can dent it some.

Let me clear this up before someone tries to tear me a new one. I am not trying to justify piracy by saying it is moral or anything like that, just explaining a bit of why and whatnot.

I am sorry if a lot of this reads weird, I am tired and it sounded alright in my head, and I know it may not come that way in text.

tl;dr - Did they win? No. But they're taking a step in the right direction.