People cite Wikipedia all the time in peer-reviewed journal papers. Many e.g. high school teachers recommend that their students not cite (any) encyclopedias directly, because they want the students to learn how to read and cite primary sources.
Reading a secondary source for an overview then diving into primary sources is a perfectly fine and ethical way to do research. I can’t see how schools and teachers advising students to read secondary sources for context but then follow their references to primary sources to read for the details would cause any kind of ethical compromise.
There is no reason to cite SciHub (just like there is no reason to cite Academia.edu, ResearchGate, some professor’s personal webpage with a hosted preprint, Google Scholar, etc.) whether or not someone uses it.
Reading a secondary source for an overview then diving into primary sources is a perfectly fine and ethical way to do research. I can’t see how schools and teachers advising students to read secondary sources for context but then follow their references to primary sources to read for the details would cause any kind of ethical compromise.
There is no reason to cite SciHub (just like there is no reason to cite Academia.edu, ResearchGate, some professor’s personal webpage with a hosted preprint, Google Scholar, etc.) whether or not someone uses it.