> All they need to do is "randomly" label 99,999 of every 100,000 as AI and they'll be right 99.999% of the time.

Unfortunately that could still be true while labeling all human-crafted content as AI-created.

Not sure why you appear to be downvoted. Cryptographic provenance is indeed the only solution to humanities digital woes. But only the government could make that a rule so it's not going to happen - at least not in my lifetime.