I am still baffled that admins decided to do nothing about many AI generated posts and that they don't consider it as plagiarism. Plagiarism is exactly what it is. They didn't write the content - someone/something else did. They didn't mention the source of the content, which means they are pretending they are the original creators. That's what plagiarism is.
Well,
it's not as simple as that.
Plagiarism
the process or practice of using another person's ideas or work and pretending that it is your own
Copying and pasting from an AI is not subject to copyright issues in many cases. In the case of the OP he is not simply copying and pasting something that the AI is making up, in order for the AI to produce that text he has had to give it a source of information from where the text has been generated. There is no plagiarism in the sense of the Cambridge dictionary and there is no copyright problem.