I don't think their is still any rules under the official & unofficial BTT rules that state the use of AI probability, but it's total discourage by members here as, it's being misused in areas which it was not supposed to be used.
Yes, to try to outsmart the forum members by making them think they are smart enough and productive in producing such a quality reply, and at the end they will be rewarded with some merit, this are the things I believe motivate them to do that.
How can we wash off this ill behavior? Because I know the offenders know it's not good and they know the implications if found doing it. What's the best thing to do to stop the use of AI from going on in this Forum?
By reporting which ever one we detect under the Report Plagiarism Copy/Paste , as I don't think there is any specific board for AI reports yet. If they get some tags or Tem Ban, I guess they will have to reduce the use of the AI-generated text.