Blizzard making workers in poor countries unemployed?

Not long before I got into online poker I gave up, once and for all, the addictive habit known as playing World of Warcraft, made by the company Blizzard. I enjoyed this brief Tim Harford column on the real world economic impact of World of Warcraft on sweatshops in developing countries, and how updates in World of Warcraft might destroy many people's real world income.