I'd argue a game developer should make their own art assets, even if they "aren't an artist". You don't have to settle for it looking bad, just use your lack of art experience as a constraint. It usually means going with something very stylized or very simple. It might not be amazing but after you do it for a few games you will have pretty decent stuff, and most importantly, your own style.

Even amateurish art can be tasteful, and it can be its own intentional vibe. A lot of indie games go with a style that doesn't take much work to pull off decently. Sure, it may look amateurish, but it will have character and humanity behind it. Whereas AI art will look amateurish in a soul-deadening way.

Look at the game Baba Is You. It's a dead simple style that anyone can pull off, and it looks good. To be fair, even though it looks easy, it still takes a good artist/designer to come up with a seemingly simple style like that. But you can at least emulate their styles instead of coming up with something totally new, and in the process you'll better develop your aesthetic senses, which honestly will improve your journey as a game developer so much more than not having to "worry" about art.