You can not compare a single instance of whacky artwork created in parody of a pop culture figure to the machine that plagiarizes the work of thousands of people and an artstyle developed over decades.

>what is the potential harm here?

Like, harm to whom? Short term, for the viewer: none. The brand reputation aspect I have already mentioned. Mid-term it's media getting boring and predictable. Long term it's culture dying and all attempts at authentic human expression through art drowning in AI generated slop. That's more of a spiritual thing.