Apart from the well-known dubious position of OpenAI wrt truth, the prompts/inputs do mot include the outputs.

You can train on a sequence of outputs. In the end, OpenAI outputs are OpenAI's property.

You can learn a lot from a single side of a conversation.

But isn’t Tristan’s breakthrough happens in August? OpenAI can’t really train with text that doesn’t exist

But using the outputs to train would make their statement false, since they are influenced by the inputs