The Atlantic's AI Watchdog - not everyone will be able to open it, but I'll park this here anyway.
The Atlantic’s ongoing investigation of the books, videos, and other media used by the world’s most powerful tech companies to train their AI models.

Explore the data sets
See whose work tech companies are using to train their generative-AI models. Search for authors, YouTube channels and creators, or screenwriters—for example, Zadie Smith, MrBeast, or Aaron Sorkin. AI companies may omit certain works when training, so the presence of a work in a data set is not definitive proof that it was used. Companies often use multiple data sets in training, so the absence of a given work is also not proof that it hasn't been used. Note that some data sets contain multiple copies of certain works. Read our FAQ for additional information.