Which gaming platform first introduced a user-generated content marketplace that allows creators to sell their own in-game items and receive a portion of sales revenue?

The gaming industry has transformed retail strategies with innovative virtual marketplaces and in-game economies. Major gaming platforms have pioneered new ways to monetize digital products, creating billion-dollar revenue streams from virtual goods. This poll tests your knowledge of how a major gaming retailer revolutionized the industry with its marketplace approach.

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Valve's Steam Workshop (2011)
Sony's PlayStation Store (2008)
Microsoft's Xbox Marketplace (2009)
Epic Games Store (2018)