Process is the same, but intent is not. One intent is to extract information from the book for better general eloquence and overall awareness - not for replicating the book itself (ability to recall verbatim fragments is a side effect, not the goal). Another intent is to replicate the behavior, carry it over using training.

Again - IANAL - but in my understanding (and I spend some time reading on this), the legal concept of fair use is all about the intent how copyrighted material is used. It's all copying or distribution, but law does make distinction about what and why.