ChatGPT quality strangely gotten worse
community.openai.com
community.openai.com
Otherwise, I really doubt any of these reports. "ChatGPT got worse" is so common that, if it was true, there'd be solid emperical evidence (there's the Stanford study, https://arxiv.org/pdf/2307.09009, which shows ChatGPT can degrade across releases, and I believe that; but these claims are about it degrading in the same release).