What is the current state of such book libraries (in the sense of, "these are some that are alive")? I can never keep track of which among LibGen, BookFi, etc.

What is the current state of such book libraries (in the sense of, "these are some that are alive")? I can never keep track of which among LibGen, BookFi, etc., are still alive, which are alive but not loading, which are the same under different names, and so on.