Unknown Worlds has issued a warning to everyone not to buy Natural Selection 2 Steam keys from any shady websites. The Natural Selection 2 developers revealed that 1,341 keys had to be deactivated, as they were likely purchased with stolen credit cards. Naturally, many card holders asked for a "charge back" in order to be refunded. Not only does Unknown Worlds lose the $25 from the original sale, but they also get charged a fee of $22 for the process.
In total, the developers have lost approximately $30,000 from the entire debacle. They also mention that the only way to know that a key is legitimate is to buy it either directly from Steam or from the Humble Bundle store. There is also a list of authorized retailers, and it will continually be updated if more sellers become authorized.
Remember, stick to the websites that you know and trust!
I'm glad that Call of Duty: Advanced Warfare isn't afraid to embrace the strange
10:30 AM on 03.25.2015