My thinking is, that it’s a moderation problem. Some text smells wrong, and enquiries are made, and it’s flagged as “machine generated but not tagged as such”, or flagged as “probable spam”.
I think I gather that some people are trying to make services which can detect machine generated text, but I don’t know how effective they are, or how expensive they will be. In the world of education, it’s about cheating, and there are motivations for detecting it.