> "Generating placeholder assets is completely acceptable, etc."

Not if it's against the rule. They got caught with skidmarks. And while the "Ackshually, those skidmarks are just placeholders"-defense may elicit a few cheap laughs, it doesn't matter if you follow the rule to its logical conclusion. Any possible deception in such cases comes on top of it. As it always has; that doesn't change just because you found a new plaything (LLMs) in the box.