I can also get Disney coloring book pages directly from Google's cache on Google images: https://www.google.com/search?q=disney+princess+coloring+boo...
Authors Guild, Inc. v. Google, Inc. determined that Google's wholesale scanning and uploading of books is allowed under the first sale doctrine because the University of Michigan library they borrowed the books to scan from paid for them (or a donor paid for them, at some point). Here's a book of bedtime stories available in its entirety: https://www.google.com/books/edition/Picnics_in_the_Wood_and...
Also, Google can and will delist stuff that is violating copyright if you report it: https://transparencyreport.google.com/copyright/overview
The Google Books thing is a lot more interesting I think. I guess the idea is that Google is acting as a Library, and they are lending you the book? I'm not sure how I feel about this and I would need to do a lot more research on it before having a strong opinion.
The other big difference here is that you can't use the content linked from Google search as if it were your own. If you Google search "nes emulator in javascript", and you get a link to a Github repo, you can't copy paste the code as if it were your own, and even basing your code on what you have saw could be risky depending on the license of the repo. LLMs are acting as a sort of search engine, pretty similar to how Google search does, but people are using the output from the "search" as if it were their own work that they have full rights to!
If you search for a Disney movie on Google search, it does not try to sell you a film derived from the movie.