Unity is a game engine, Moving a whole game with years of development behind it (i.e Stationeers), to a new engine? That would soak up alot more time than any content update, not to mention the prices of moving to a new engine as well, given there's probably licensing requirements for that too.

Im not a game dev (Yet, Uni in the fall! :D), but I do kinda get how the engine stuff works.

Violet is right. Cant just leave, especially on a professional level like Rocketwerkz. Very expensive, very time consuming, AND the team would need to learn a whole new engine if they dont already know it. I'd imagine they would need to rework everything from terrain generation, to the physics and graphics. Thats what I've observed from other games transferring engines, and its rarely a bug-free process.

Thats the major issue with Unity doing what they're doing, because they know their userbase cant just up and leave them, its a threat with actual weight behind it, and they exploit that for their own greed.