If Monster Hunter: World generated the same gross revenue on the Epic Games Store, CAPCOM Co., Ltd. would keep approximately $200,195,960 - that's $21,308,724 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $27,163,086. 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 $159,151,332.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.