> Warez means specifically software piracy. So pirating ebooks is not warez

Warez sites often link to more than just software. Software may or may not be the primary focus. Terminology evolves.

As an example of how far the terminology has come, consider the purported line “Let me taste your wares”[0] from the nursery rhyme "Simple Simon", which possibly dates back to the 17th century.[1]

[0] https://songswithsimon.com/simple-simon/

[1] https://en.wikipedia.org/wiki/Simple_Simon_%28nursery_rhyme%...

What is the term for books then?

eB00KZ