You ever see warning labels on products? That's because putting them in terms and conditions isn't enough to avoid liability in a products liability case.
No, not really. It does not help. It evidences that they knew the risks were present but did not take the actions to adequately warn the consumers of its products, which OpenAI knows do not read the entirety of the TOS.
Again, this is exactly why you see warning labels on products. Prohibiting certain uses in small text, hidden in the TOS, is not a warning.