I think that's the easy bit. For me at least.

Any sort of artwork is expensive to commission though. And if you're born without a shred of artistic talent in your entire being, you ain't doing it yourself.

So I've got some very broad strokes vision of a game I want to build and I haven't expanded on it further because I know I can't afford to make it.

If I do decide to make it, I'd have to hire someone to do 3D modelling* at the very least. I don't see a world where that's feasible without copyright, because then I'd just be paying someone's salary (or commissions) and be out of pocket for it.

* No, don't worry, I'm not thinking of yet another photorealistic-ish looking 3D game. More like something in the style of the 3D Zelda games or like some of the (MMO)RPGs of the 00s.