If ACE COMBAT 7: SKIES UNKNOWN generated the same gross revenue on the Epic Games Store, Bandai Namco Studios Inc. would keep approximately $69,607,929 - that's $9,437,084 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $9,355,627. 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 $55,274,489.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.