Which gaming platform first introduced a comprehensive virtual marketplace that allowed independent developers to sell their creations directly to players, pioneering the 'user-generated content economy' model?

In the evolving landscape of gaming and virtual worlds, some product decisions have changed the entire trajectory of the industry. This trivia question focuses on a pivotal moment in corporate gaming history that revolutionized how we think about virtual marketplaces and in-game economies. Test your knowledge about the business decisions that shaped modern gaming!

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Second Life (Linden Lab, 2003)
PlayStation Home (Sony, 2008)
Xbox Live Marketplace (Microsoft, 2005)
Steam Workshop (Valve, 2011)