> LLMs came along and erased that assumption. Now you don't know if that e-mail, that 12-page design document, the 100 or 1000 line PR, or those 10 Jira tickets were written by someone who invested a lot of their own time into producing something, or if they had their AI subscription generate something that looked plausible.

Oh, we know. It's pretty clear in many cases.

Perhaps a less-brittle version would be to replace "we don't know X" with "we can't easily prove X to the extent needed to deter it."

lol yeeh... its obvious as hell.

And frankly the best signal now is: the shorter it is the greater the likelihood it was at least expensive for the human to produce. Said in another way - a shorter thing is easier to make sense of completely and if its garbage - its garbage. At least the cost borne on you was minimised!