Most of the courses are large lectures that students can skip anonymously. And, the larger the class, the larger the audience for Wolf's advertisers, who hope to gain brand loyalty among college students. He hasn't used either service. But because there are students who are content with just reading other students' notes, the Internet sites will likely continue to thrive. But you are depending on if that person is a good note-taker.
Critical professors say the notes often are inaccurate or incomplete.
There is no quality control and there is the potential for spreading inaccurate information. They are absolutely, positively, not the professor's lecture notes. And that leads to the exact reason why some professors don't think the sites will survive. Maybe somebody is getting paid to download my notes and give them to these note services. Point your browser Free lecture notes for some courses at five Michigan campuses are available at two Internet sites.