80 million papers are available on Sci-Hub to its half a million daily users.[1] That is around 80 TB of data, and 2 TB of daily outbound traffic.[2]
Given the fact that Sci-Hub has achieved all those whilst being forced to operate under the radar, I have massive respect for Elbakyan first and then all the others that have helped it survive. Not only Sci-Hub is an undeniable disruption, but also an amazing technical feat that many startups would envy.
[0]: https://greenelab.github.io/scihub-manuscript/
[1]: https://translate.google.com/translate?sl=auto&tl=en&u=https...
[2]: 3 articles × each 2 MB × per 400k users ~ 2.4 TB.
P.S. Seed its torrents!