How is that a leak? Only the publishing companies are making money. Authors, reviewers and often editors all work for free.
I don't think they work for free, they have a salary, usually paid by universities I think.
What does this have to do with privacy?
Publishers want to keep the papers relatively private.
The fact that scihub needs to skip domain names every couple of months and that ISPs start blocking the website, looks to confirm my theory, rather than imply some worldwide conspiracy.