Alec Kieft makes games for "youtube for gaming" platform Roblox, including Break-In, a smash hit which has been played over 2bn times by 80m people. The platform is wildly popular with pre-teens, and is widely considered the closest thing to an operating metaverse which exists in the world today. Kieft joins Duncan Greive on The Fold to explain what drives the culture and economy of this hidden world.

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