Which pioneering inventory management system, first implemented by Valve for Steam in 2011, revolutionized digital game distribution by predicting demand through machine learning?

The gaming industry has transformed retail strategies dramatically over the last decade. From physical cartridges to digital downloads, from standard editions to battle passes - the way games are sold and distributed has revolutionized retail models. This trivia question explores how major gaming companies have pioneered innovative inventory management systems that have since influenced broader retail trends.

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SteamWorks Predictive Inventory System (SPIS)
Epic Games Store Dynamic Allocation Protocol (EGSDAP)
PlayStation Network Automated Resource Management (PNARM)
Xbox Live Content Distribution Framework (XLCDF)