Which gaming company first introduced a user-generated content marketplace where creators could sell virtual items and receive real-world currency, revolutionizing in-game economies?

The gaming industry has transformed retail experiences through in-game purchases and virtual economies. This trivia question explores how a major gaming company revolutionized product development and consumer engagement through its innovative marketplace strategy. Test your knowledge about how gaming platforms have created new retail paradigms and revenue streams in virtual worlds!

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Roblox Corporation (with Robux exchange system)
Valve Corporation (with Steam Workshop)
Linden Lab (with Second Life's marketplace in 2003)
Epic Games (with Fortnite Creator Marketplace)