If Life is Strange 2 generated the same gross revenue on the Epic Games Store, DONTNOD Entertainment, Feral Interactive (Mac), Feral Interactive (Linux) would keep approximately $24,588,581 - that's $4,234,677 more than on Steam.
At this revenue level, Epic's concrete platform fee would be $3,216,625. 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 $19,463,644.
Note: This is a hypothetical comparison. Actual sales volumes differ significantly between platforms, and Steam's larger user base typically drives substantially higher sales.