Originally noted by ResearchBuzz, from PsyPost: The “Sci-Hub effect” can almost double the citations of research articles, study suggests.
The researchers found that articles downloaded from Sci-Hub were cited more frequently compared to articles not downloaded from Sci-Hub. After controlling for variables such as the number of figures included in a paper, title length, the number of authors per article, the H-index of the first author, and the impact factor of the journal, Correa and his colleagues found that articles downloaded from Sci-Hub were cited 1.72 times more frequently on average.
This would seem to me to be more proof that making articles available via open access (i.e. not behind a paywall) is a good way to get yourself cited.