Well, what the file includes is all the old doxbin sources, and the recent one. So if you want a older version of Doxbin you can find it here.
Doxbin is actually a pastebin, but is more used for uploading private information of people.
Doxbin was in like 2011 pretty popular, and was used via the TOR browser, many people uploaded there all sort of things, and yes. There was illegal things uploaded as well, not only doxes or leaks/shares etc.
That is why it was later taken down by the Federal Bureau of Investigation.