My university attending friend who is financially affluent wishes to know where people are downloading z library books now? He is a law abiding stand up dude

My university attending friend who is financially affluent wishes to know where people are downloading z library books now? He is a law abiding stand up dude who pays for music and wants to write a thesis paper on z library and absolutely does not wish to download these books. ( He is also asking if there is any anime/manga books as he is an Asian American History major )