Cliffs Notes adds commentary and critique for educational purposes, they are doing what fair use is intended for. Copilot does not.
Also, it's pointless to say "But X does Y" in copyright discussions. You never know if they license the content properly or if they infringe the rights. In the Cliffs Notes case, they might not need fair use at all, because the old works are already in public domain.
Also, it's pointless to say "But X does Y" in copyright discussions. You never know if they license the content properly or if they infringe the rights. In the Cliffs Notes case, they might not need fair use at all, because the old works are already in public domain.