Well, there are tools for which their existence is already unethical because of how they were made. There is debate about that. While an exagarration, you can see a similar thing going on with veganism. The tools being food and things like leather. Vegans do not care how you use that leather glove.
And whatever someone wants to express through their AI made game, some will consider it cheaply made. Games are part of the art spectrum of crafts. They are not a necessity. So which artists to support is a complex question. And I think if you support an artist who uses AI, you do it despite the AI usage, and not because of it. While you might support the artisanship of a hand drawn game because it is hand made.
I can tolerate AI out of need for resources and lack of skills in the visual arts. But there are some that let even the plot be written by AI. That can be funny once as an experimental game. But it would be the core of what you call expression. With AI, that's not expression, that's a cheap cash grab. You do not even need AI for that kind of shovelware.
It will be a while till AI operating and prompting skills are recognised as their own skillset. Unfortunately, there is no grace period where only professionals can use the tech, like there was for photography. Anyone can type something in a prompt. I wonder how photography would be seen, if it had started with a device like a smartphone.