I do make use of AI detection tools, both free versions and a paid one I subscribed to after Too Many Of These Incidents For Me, but mostly they’re confirmation for me when something feels REALLY off. There’s tons of AI generated stuff that’s actually been edited or was just a touch-up on something a human wrote that I don’t and would never notice. I associate LLM with being over-long and flat yet also weirdly effusive, mainly, but it’s usually not ‘bad’ writing, as such. It’s weird because it’s not ‘written’ at all, it’s word-generated-after-word. ‘Simple’ language that’s also repetitive due to that generation is probably the rhythm of it that twigs me the most. This article mentions it and some other tells.
https://readwrite.com/how-to-tell-if-something-is-written-by-chatgpt/
IDK, I think there’s also a ‘scales falling from your eyes’ quality when you know this stuff is becoming widespread (presuming it bothers you, I guess). Once you actually start to look for it, you start to see it when it’s obvious, and a lot of the time people don’t bother not to make it obvious.