Lol
Free dissemination of knowledge that benefits the advancement of mankind should never be illegal. In fact, Z-Library being illegal is immoral. That being said, I simply use Z-Library to inspect books before purchasing them. Translations from different authors are often remarkably different. Sometimes books have horrible layout. So yeah, Z-Library has been indispensable to avoid wasting money. Case in point, part of the first paragraph of Dostoevsky's House of the Dead, the Dover versus Penguin edition
If z library only contained actual knowledge sure, but it seems to be primarily fiction. But no it's immoral because the author likes to save money and not go to a physical store.
I like piracy too but saying that banning piracy is immoral and comparing it to apartheid, slavery and ccolonialism is just ridiculous.