I think a crucial difference here is that images are (slightly) more defensible.

There are still some tells that indicate an image was AI created. It's enough to mark them as AI and discourage brands from using them, after pushback. At this point, the human difference is noticeable.

This isn't the case for code. No one can tell the difference between AI and human-generated code, not at the point at which users access it. And since there isn't there really isn't much to 'fight.'