I think the first AIs were trained on human-only generated code and the quality was quite ok. Now AI has already produced a significant quantity of less-than-ok

I think the first AIs were trained on human-only generated code and the quality was quite ok. Now AI has already produced a significant quantity of less-than-ok quality code that humans spread across all the different code hosting sites. That said quantity of AI-generated code "polluted" the training sets of all future AIs, because AI auto-feeding itself cannot give good results. I don't see how the quality can improve.