Frankly, get over it.
A lump of algebra will instantly draw whatever you describe. Or finish whatever you doodle. Or clean up two things you've lazily bodged together. No shit it's gonna get used for placeholder imagery.
If a game ships with Shutterstock logos on a texture, that's an embarrassing flub, but nobody screeches how they can't believe a developer would do this to them. There's no moral panic when a crate label still reads "Alan please add details." If the whole game is human-authored aside from one JPG they missed, then even the hater-est of AI haters are crying wolf. Modern development can obviously make excellent use of this witchcraft. These are artists, being paid to do art, and it helps them make the thing.