If Worms W.M.D generated the same gross revenue on the Epic Games Store, Team17 would keep approximately $8,820,761 - that's $1,899,701 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $1,066,467. 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 $6,921,060.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.