It's a matter of scale and frequency; people were posting significant amount of low-quality nonsense generated by ChatGPT. The average quality of ChatGPT was (i

It's a matter of scale and frequency; people were posting significant amount of low-quality nonsense generated by ChatGPT. The average quality of ChatGPT was (is) significantly lower than the average human answer and there were thousands of those answers. As a test I ran some questions through ChatGPT a few weeks ago; both popular ones and just some random ones from the homepage (including some not-very-good questions). In only one case would I say that it was "good enough" to post. All the rest ranged from "mostly correct but with huge omissions" to "used 5 paragraphs to explain what could be one or two sentences" to "this is not even remotely correct in any way, but at a glance it actually looks kinda correct". The "looks kinda correct" can be pretty misleading, because there have been a few answers where I went "wait, is this actually a thing? I didn't know about that!" and when investigating further it turned out it wasn't a thing at all and ChatGPT was just trolling me.