Which gaming company pioneered the first successful digital distribution platform for PC games, fundamentally changing gaming retail models?

The gaming industry's retail landscape has transformed dramatically over the past two decades. From physical game stores to digital marketplaces and subscription services, the way games are sold and distributed continues to evolve. This trivia question tests your knowledge about a pivotal moment in gaming retail history that changed how games are bought and sold forever.

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Valve Corporation (with Steam)
Electronic Arts (with Origin)
Epic Games (with Epic Games Store)
CD Projekt (with GOG.com)