If Hunt: Showdown 1896 generated the same gross revenue on the Epic Games Store, Crytek would keep approximately $115,383,042 - that's $13,598,458 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $15,597,688. Epic charges 0% on the first $1 million in annual per-app revenue and then 12% on the remaining amount. On GOG (30% cut), the developer would earn approximately $91,686,511.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.