Generally the problem with systems like this is that you need a critical mass of users to rate books for a site to have any value. If the only ratings you see a

Generally the problem with systems like this is that you need a critical mass of users to rate books for a site to have any value. If the only ratings you see are from people you trust, this becomes a lot worse. Once you add UI friction, adoption drops even more. Generally because of network effects, sites that use dark patterns and prioritize engagement over trustworthiness will tend to thrive. Just look at the history of social media.