The best video essay on the movie
https://www.smbc-comics.com/comic/2013-06-05
https://www.smbc-comics.com/comic/captcha
which may be either funner or scarier in light of the actual existence of Moltbook.
That would prove the message came directly from the LLM output.
That at least would be more difficult to game than a captcha which could be MITM'd.
It doesn’t really matter, though: you can ask a model to rewrite your text in its own words.
So either moltbook requires that AI agents upload themselves to it to be executed in a sandbox, or else we have a test that can be repurposed to answer whether God exists.