You should know that there's been at least one fork (.fun vs .rs) and it's unclear which is more active and should be used going forward.

I hadn't realised the link between Library Genesis and Sci-Hub until I read the Wikipedia article on it. Are there any other good sources of info around Library Genesis as a project, i.e. aims, technologies etc. not end-user guides or how-tos?

https://en.wikipedia.org/wiki/Library_Genesis