Z-Library was significantly attacked recently. There was a huge takedown in 2022, and I'm finding reports as of March 2024 as well:
2024: "FBI Carries Out Fresh Round of Z-Library Domain Name Seizures" <https://torrentfreak.com/fbi-carries-out-fresh-round-of-z-li...>
2022: "Z-Library operators arrested, charged with criminal copyright infringement" <https://www.theregister.com/2022/11/18/zlibrary_operators_ar...>
The Z-Library arrests were of Russian nationals, but were arrested in Argentina.
The first Torrentfreak article mentions two other actions in Spring and November 2023.
Sci-Hub has played cat-and-mouse with domains for years, and AFAIU has still withheld posting new scientific articles given pending litigation/prosecution in India.
Another Torrentfreak article from Nov 2023 gives an update on numerous issues with text liberation sites, including Anna's Archive, Sci-Hub, and Z-Library. At the time, the Anna's Archive twitter account had been "wiped out", so much for that platform's "free speech" stance.
<https://torrentfreak.com/copyright-piracy-news-brief-1-extra...>
Sci-Hub is down (as in, you can't search/view/download papers from sci-hub.se), AFAIK.
Anna's Archive aggregates into a unified database material from Libgen.rs, Sci-Hub, Libgen.li, Z-Library, Internet Archive Controlled Digital Lending, and DuXiu 读秀. (See: https://annas-archive.org/datasets )
<https://torrentfreak.com/domain-registry-takes-sci-hubs-se-d...>