I think ultimately text is too structured by itself to be able to understand whether it's AI-generated or not. You can easily tell LLMs to write in a different

I think ultimately text is too structured by itself to be able to understand whether it's AI-generated or not. You can easily tell LLMs to write in a different style or even give examples, and they'll happily oblige. Those tools are mostly useful for filtering out the laziest users who haven't tried playing around with the models enough.