If Schedule I generated the same gross revenue on the Epic Games Store, TVGS would keep approximately $82,487,761 - that's $10,607,978 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $11,111,967. 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 $65,519,810.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.