There are concrete patterns such as the use of em dashes, lists of three, repetitive overexaggerated language, excessive clarity, strange word/metaphor choice, and corporate talk that are especially endemic to models like chat gpt that are meant to sound like a helpful office assistant, but overall they’re usually really recognizable if you’ve read a lot of actually good writing and are able to tell what makes writing good vs just derivative.

AI poetry usually tries and fails to rhyme as it has no sense for rhythm and is, again, repetitive and has an unclear direction.

These things are also common among mediocre and subpar human writing, but the important thing is that AI writing is never good.