Or, (2) LLMs are creative and do have agency, and feeding them bland prompts doesn't get their juices flowing. Copyright isn't a concern, the model just regurgitated a cheap likeness of Indiana Jones as Harrison Ford the world has seen ad nauseam. You'd probably do the same thing if someone prompted you the same way, you lazy energy conserving organism you.
In any case, perhaps the idea "cheap prompts yield cheap outputs" holds true. You're asking the model respond to the entirely uninspired phrase: "an image of an archeologist adventurer who wears a hat and uses a bullwhip". It's not surprising to me that the model outputs a generic pop-culture-shaped image that looks uncannily like the most iconic and popular rendition of the idea: Harrison Ford.
If you look at the type of prompts our new generation of prompt artists are using over in communities like Midjourney, a cheap generic sentence doesn't cut it.