Zlib is still alive
as far as we know, zlib was forced to shut down by the USA government. However, it still remains available on the dark web, we can visit it through the tor-browser, and its address is posted on the Wikipedia, Here is the address: loginzlib2vrak5zzpcocc3ouizykn6k5qecgj2tzlnab5wcbqhembyd.onion