In my experience, Yandex has always been better for piracy than any other search engine.

I’m not completely sure. Sometimes I find stuff in one site I don’t find in any of the other two. Also, I don’t know how often catalogues are synced.

Yes. I combine libgen with Anna’s Archive and Z-Library and there’s very, very little I can’t find.

Combine that with KOReader and this is pure bliss.