@UlrikeHahn@jonny@tdverstynen Sci-Hub/LibGen scrape journals using access credentials to get pdfs, and add more when a document is searched for but not found in it's database. Peer-to-peer is just giving remote access to your documents or whichever folder to anyone with a program like Soulseek or whatever people use nowadays. Neither of these are affected by citation count, and I've found papers that have 0 cites according to goog scholar
"as of March 2017, Sci-Hub’s database contains 68.9% of the 81.6 million scholarly articles registered with Crossref and 85.1% of articles published in toll access journals" 10.7554/eLife.32822
It's missing some articles but way less than the amount without citations