Earlier quoted context omitted.
It is note worthy that most of physics (at least high energy physics) ist published on arxiv.org and open access. I don't know if sci hub bothers with publications that are available freely from an official source.
> published on arxiv.org and open access Don't use the term "open access" like this. A paper published on arXiv is free to read, and was freely published. "Open access" is a scam by the big publishers, where they don't take money from the readers , but make the authors pay. Or, putting it another way, anyone can pay their way in those journals and publish (sometimes sub par) papers.
https://openaccess.mpg.de/Berlin-Declaration
Publishers do misuse the concept though. They try to stay clear of using the term when they do. They use terms like Free Access or some of the more dubious colour variants of OA that doesn't provide all the freedoms that the Berlin Declaration of OA defines.
Interestingly articles uploaded to arXiv with the arXiv.org perpetual non-exclusive license are not OA as the reader is not allowed to redistribute the paper.