If MULLET MADJACK generated the same gross revenue on the Epic Games Store, HAMMER95 would keep approximately $3,446,872 - that's $800,497 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $333,664. 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 $2,646,376.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.