@ClaudiaTranslates I would say this is useful information mainly because it tells us about where the training data came from, which is helpful in understanding how to make defenses against the threat ChatGPT poses to our democracy.
The idea of opting out individually seems not super effective or useful. It won't mitigate the harm. It doesn't work as a way to keep them from violating open-source licenses like Wikipedia's, especially since open-source licensed text is often mirrored and reused.