Which retail strategy did Epic Games Store use in 2019 that most dramatically accelerated its growth against Steam's dominance?

In the competitive world of digital game distribution, platforms have employed various strategies to gain market share from established leaders like Steam. One platform made a particularly aggressive move that transformed the digital retail landscape for PC gaming. This poll tests your knowledge of recent digital distribution disruption strategies in the gaming industry.

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Offering developers an 88/12 revenue split (compared to Steam's 70/30)
Implementing a subscription model similar to Xbox Game Pass
Creating an open-source storefront API for developers
Focusing exclusively on indie game distribution with no AAA titles