I think this decision is being done as a matter of pragmatism. Nobody likes generative AI and game creators currently do lie about using it regularly. And it's not really possible to prove someone used it when coming up with ideas for their game because generic and uninspired games have existed long before chat bots.

The magic trick that neural networks were actually built to do is finding biases and patterns in large sets of data. They can link snakes to water, dwarves to fire, and help you build the next completely unoriginal fantasy rpg by including these links other people have made in your game. And though people might claim to not want this, people still pay good money for bethesda games.