If LEGO® MARVEL's Avengers generated the same gross revenue on the Epic Games Store, Traveller's Tales would keep approximately $2,519,570 - that's $610,821 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $207,214. 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 $1,908,749.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.