Visit this website https://privacy.openai.com/policies/en/ , click "Make a Privacy Request", choose "Do not train on my content", and complete the form. That submits a formal objection to training on your data, as required by GDPR/your local legislation.
They would do it, the say “ah sorry chaps, impossible to extract it from the dataset by now, anyway we anonymized it so can’t tell what’s what, and we can’t risk losing to China. Oh look - did you see Superman fly outside?”.
What’s a problem is that they haven’t outright denied it. That could be caution and them doing their due diligence first, it could be that it was intentional and they didn’t expect to get caught, or it could be because they have no way of knowing themselves.
This looks incorrect. OpenAI have flat out said that there's no need of doing this and both ways are equivalent
> We respect our users' choice whether to use their data to “improve our models for everyone” regardless of where they express that choice. Users can opt out in the in-app settings or indeed also in our privacy portal. They do not need to opt out in both places, and we will make this clearer in our Help Center.
Option B is legally binding and permanent.
The one in ChatGPT settings only applies to ChatGPT. The one on the OpenAI privacy portal applies to all OpenAI products, present and future.