Do you have a source for this? I know some people have claimed to see others' data, but I haven't seen any evidence that that's what's actually being seen, vs LLM hallucinations. OpenAI claims, and I can't imagine they're lying, that the training data is fixed and ends in 2021, so I don't see how it would be possible for user prompts to be leaking into output, absent a massive and very unlikely bug (compared to the much more likely AI hallucination explanation).