OpenAI Data Opt Out Request Form (docs.google.com)

This is linked from this OpenAI help page: https://help.openai.com/en/articles/7039943-data-usage-for-c...

I find it darkly amusing that they allow their users to opt out of having their data used for training, but they didn't deign to give the rest of us that option when they built this thing in the first place.