To share or not to share study materials for an exam

The undergraduate course I'm taking this semester is giving me an interesting insight on how class should be taught and how exams should assess students' academic success.

One student shared all the class notes and quiz answers that we did so far, and asked other students to check/edit where necessary to enhance her understanding of the material. There seemed to be nothing wrong with it, but she accidetally sent the link to it to the lecturers and TAs, and got into trouble - it was inappropriate to share those materials, according to the teachers.

Why inappropiate exactly?
Probably because it will not help other students learn the material, but rather memorize whatever written on there. Also, by showing the notes from class, it will give the same information to students who did not attend the class at all, in extreme cases. The credibility of the content is not guaranteed, but everyone knows that - since it is not coming from the lecturers or the TAs, you use the materials at your own risk.

Her idea was that she needed some help in making her notes perfect, and making better answers for possible exam questions. There seems to be nothing wrong with it. What is it different from asking your classmate to show their notes from class you could ot attend? It was unfortunate that she accidentally sent the link to the teachers.

The problem is maybe this class content and exam format - it is more of memorizing a lot of detailed info in a short period of time (ie before an exam) and forget everything after that rather than you get  basic info, materials to think, and provide your thoughtful, logical answers to a real-life problem based on what you learned in the class. It's hard to teach this kind of  class, but there should be more materials to ponder, not just facts and names to remember. What is missing is things (contexts) that connect each random item.

The class is halfway through, and this portion of the semester is only like this, maybe. Just lots of random things around the world. I hope the final third of the class is more about what you think and how we can provide solutions to modern dietary problems.