If DRAGON QUEST BUILDERS 2 generated the same gross revenue on the Epic Games Store, Square Enix, KOEI TECMO GAMES CO., LTD. would keep approximately $8,281,445 - that's $1,789,387 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $992,924. 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 $6,492,059.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.