This is usually done to make it harder for the courts to force providers to block these sites. Whack-a-mole..

PS: Why am I getting downvoted? Try clicking on the links, you will see the same goodbye message.

Edit: Oh the first 2 do seem to be clones, now I understand. The rest are proxies though. I do think even the clones basically skived off the original's database though so I doubt they will have much going forward.