Earlier quoted context omitted.
It's not that simple. Originally OpenAI released a model to try and detect whether some content was generated by an LLM or not. They later dropped the service as it wasn't accurate. Today's models are so good at text generation it's not possible in most cases to differentiate between a human and machine generated text.
Well they could just not allow prompts that seem to participate in blogspam. If they wanted to stop it they definitely could. Their argument is that since it's centralized, things like that are possible (while with llama2 you can't), they do "patch" things all the time. But since blobspam are contributing to paying back the billions microsoft expects they're not going to.
Unfortunately, any question that lots of people legitimately ask will also be a prompt for blogspam.