As an outsider who doesn't have any experience with scientific papers and how to get them, it seems very obvious to me that there should be a huge demand for an open platform to publish and read those papers - from authors and readers alike. Why does this role need to be filled by an at best semi-legal party like SciHub?
The fact that users with legitimate access to those papers actually opt for SciHub to get them confirms that the current solutions just aren't working for their users. So why would authors rely on them?