How do they source papers? I can't find this detail neither in the article nor in Sci-Hub's "about" page. Do they install a peer-to-peer client on the machines

How do they source papers? I can't find this detail neither in the article nor in Sci-Hub's "about" page. Do they install a peer-to-peer client on the machines of volunteers, so that Elsevier can't make the difference between a scientist and a pirate scientist? Why then Elsevier doesn't tag each paper with spelling mistakes so that they can trace the researcher who pirated the paper? And, last point, ...should we just give up about copyright protection? Any country who wants to advance (Russia, now China) needs to cheat on the WTO, it makes everyone less free and it doesn't work. Even software companies don't rely on copyright anymore - Microsoft sells to OEMs, not to end-users, and selling SAAS helps prevent the code from being published because the BSA approach dosn't work.