[mr_tombuben]

Traditional VC companies wouldn't work because they'll always enshittify. Even on consumer space, you can see enshittification from MS, Sony and Apple. I really don't see a reason why the companies you listed would need that 2% royalty at all honestly. They already get the 30% from the sales themselves, and could very well financially support the existence of an OSS game engine with no extra royalties. Sony and MS already develop the Unity and Unreal integration for their platforms without charging extra royalties.

The devs using the OSS engine also wouldn't be stopped from spending resources on making the engine better for their uses (and in turn, making it also better for everyone), similarly how it works with Linux.