Sci-Hub only access is through a university network if it's the first time anyone has requested that article through Sci-Hub. It does cache the result on its ow

Sci-Hub only access is through a university network if it's the first time anyone has requested that article through Sci-Hub. It does cache the result on its own servers, though, so subsequent requests will be served from those. (It used to cache them on LibGen, and I think it does still store them there, but I seem to recall it now uses its own servers as well.)