There's the rub, isn't it? At a certain point of AI progression, if you don't point it out, no one would know it's AI, as it's indistinguishable from a human creation. Even tools based on AI to detect AI creations will themselves succumb to the fact that the generator AI can use the information gleaned by the discriminator AI to improve; this is in fact how generative adversarial networks work.

I wonder if soon in the future highly skilled humans will have to prove their works weren't made by AI.

> If the Office becomes aware that information essential to its evaluation of registrability “has been omitted entirely from the application or is questionable,” it may take steps to cancel the registration. 44 Separately, a court may disregard a registration in an infringement action pursuant to section 411(b) of the Copyright Act if it concludes that the applicant knowingly provided the Office with inaccurate information, and the accurate information would have resulted in the refusal of the registration.

From https://copyright.gov/ai/ai_policy_guidance.pdf

Is the distinction between generating full works via AI and using AI in a manor indistinguishable from Grammarly respected when admitting to any use of AI?