An image of an archeologist adventurer who wears a hat and uses a bullwhip

So, no speculation as to why Spiderman and Harry Potter were forbidden but Terminator and James Bond were allowed?

They casted avada arachna on it, and basta.

I think the unstated assumption is that there's a block list somewhere being fed into a guardian model's context

If I were doing this, I would have the system generate the image, and then I would have it run a secondary estimate saying "probability that this is a picture of [list of characters that Disney has given us reference input for]". If the picture has a "looks like Spiderman" score greater than X, then block it. EDIT - To answer the question, I'm guessing Disney provided a reference set of copyrighted images and characters, and somehow forgot Indiana Jones.

There seemed to be so many that weren't blocked, which is curious.