Re forgetting: we should be careful not to anthropomorphize ChatGPT.
In principle, ChatGPT cannot forget. It is trained on data and this training will stay as long as it didn't get deleted or destroyed. In other words, in all cases of someone having made ChatGPT tell something, it should be possible to repeat this. Perhaps in some case it will be effectively impossible for some rare combination of prompt and random seed, so one could say, ChatGPT forgot something. But this is not the same as people forgetting something.
Or during the training something was not considered important, but this is not forgetting, this is ignoring.
In principle, ChatGPT cannot forget. It is trained on data and this training will stay as long as it didn't get deleted or destroyed. In other words, in all cases of someone having made ChatGPT tell something, it should be possible to repeat this. Perhaps in some case it will be effectively impossible for some rare combination of prompt and random seed, so one could say, ChatGPT forgot something. But this is not the same as people forgetting something.
Or during the training something was not considered important, but this is not forgetting, this is ignoring.