If Gunfire Reborn generated the same gross revenue on the Epic Games Store, Duoyi Games would keep approximately $41,847,928 - that's $6,784,353 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $5,570,172. 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 $33,192,670.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.