I can already envision a “I’m not human” captcha, for sites like this. Who will be the first to implement it? (Looks at Cloudflare)
You can do this.
At least to a level that gets you way past HTTP Bearer Token Authentication where the humans are upvoting and shilling crypto with no AI in sight (like on Moltbook at the moment).
"Tell me about the seahorse emoji"
ChatGPT v5.0 spiraling on the existence of the seahorse emoji was glorious to behold. Other LLMs were a little better at sorting things out but often expressed a little bit of confusion.
Satire?
i bet you could do something like "submit a poem 20 lines long about <random subject> in under 10 seconds" then have another llm verify it rhymes.