The iq test is enjoying it / finding it interesting. Falling for it is understandable, they are simulating an engaging reply guy (the original usage not the bot).
Also I think this is not a spam attack (despite feeling like it) it seems to be being done but several people, some are experimenting, and I bet some are doing it for "the good of nostr", to inject "interesting" replies and engagement.
Just like the enjoyment of ai art this is more a nostr problem than anywhere else.
