If CRISIS CORE –FINAL FANTASY VII– REUNION generated the same gross revenue on the Epic Games Store, Square Enix, TOSE CO., LTD. would keep approximately $8,490,192 - that's $1,832,085 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $1,021,390. 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 $6,658,108.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.