Which digital retail innovation first allowed gamers to resell their downloaded digital games, challenging the traditional 'no resale' model of digital distribution?

The gaming retail landscape has undergone dramatic digital transformation in the last decade. Physical game stores have adapted to the rise of digital downloads, subscription services, and virtual marketplaces. This poll tests your knowledge about a significant digital transformation milestone that changed how games are sold and distributed in the retail space. Are you a casual observer or do you understand the business forces reshaping gaming retail?

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Valve's Steam Digital Marketplace (2019)
Epic Games Store's User Transfer System (2020)
Robot Cache's Blockchain-based Digital Resale Platform (2018)
Microsoft's Xbox Game Ownership Transfer Program (2021)