I have downvoted a couple of posts trying to pass it off as their own work. I think it's quite ready to spot unless you are super good with what you ask and then customise what you get.
The thing I spot the easiest is the generalities it inserts.
Still, this is just the beginning. They are only going to get better.
Yes! You have to be a good prompt engineer which is a needed skill now! I'm getting better at it. AND you can tweak and add stuff. I could spot it I think, but I could also edit it to be unrecognisablY AI. But then, @meesterboom, we are intelligent and literate. Perhaps this is the message students need to get - you still need literacy to work the AI.
I THINK our writing is distinctive enough for all the alarm bells to go off if we tried to pass off work as AI 🤣 BUT it wont be long before it gets close. I'm still experimenting but have got to point that I realise tbere isn't much it can't do.
Even try to be funny.