When Epic Games Store launched in 2018, what revolutionary revenue-sharing model did it offer developers compared to the industry standard?

In 2018, Epic Games challenged Steam's dominance in PC game distribution by launching their own digital storefront. Their strategy to attract both developers and players was unprecedented in the industry and created significant disruption in the digital marketplace. How well do you know the bold move that changed the economics of game publishing?

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Epic offered developers 88% of revenue (keeping only 12% for themselves), compared to the industry standard 70/30 split
Epic offered a flat monthly fee structure rather than a percentage-based revenue share
Epic allowed developers to set their own revenue-sharing percentage on a sliding scale
Epic offered 75% to developers but included free marketing and promotion worth 10% of sales