transformative use or transformation is a type of fair use that builds on a copyrighted work in a different manner or for a different purpose from the original, and thus does not infringe its holder's copyright.
You can use a book to train an AI model, you can't sell a translation just because you used AI to translate it. These are two different things.
Collage is transformative, and it uses copyrighted pictures to make completely new works of art. It's the same principle.
It's also important to understand that it's a tool. You can create copyright infringing content with word, google translate or photoshop as well. The training of the model itself doesn't infringe on current copyright laws.