If YOU and ME and HER: A Love Story generated the same gross revenue on the Epic Games Store, Nitroplus would keep approximately $3,742,135 - that's $860,891 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $373,927. 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 $2,881,243.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.