Generally if you are paying full price (paying per token), then it's not used for training.
If you are not paying, or paying a consumer level price ($20/mo) you will be trained on.
ETA: In the terms they say they use your data because "free" is the only option available in preview. However it does say you can disable sharing in your settings...
If you are not paying, or paying a consumer level price ($20/mo) you will be trained on.
ETA: In the terms they say they use your data because "free" is the only option available in preview. However it does say you can disable sharing in your settings...