I'm not sure I see the logic in what you're describing. By the time you run into this "users using AI on my engine" problem, the models will be different from the ones you used to make the design. Design how you like, I would just be surprised if that choice actually ended up mattering 5 years from now.

>by the time you run into this problem

I'm describing the present day. My friend, who doesn't know anything about programming, made three games in an afternoon with Gemini.