I think that this should be the defining moment. If you look at AI-generated posts and then go back to user-generated posts, there is likely to be a difference in spelling. Especially when you consider that this bot will be used by users who are bad at English and in some questions on topics.
But while there is no clear rule, and AI lovers can post here, but I want to say that some of the phrases that the AI bot pulls out from different texts are long enough, after which one can easily accuse the one who uses AI of plagiarism.
Again, there are many newcomers here, and many do not know how the cleaning bot from plagiarism walked around the forum. At that time, many accounts were banned for copying one sentence.
Anyone who values their account should think about it. It is likely that this plagiarized machine may one day repeat its purge.