So there's an OSR for lots of things now. Dungeons & Dragons, Call of Cthulhu, Exalted... why not World of Darkness?
I'd say it has to do with the specific setting itself.
WoD has been fucked over hard by radical setting changes since Revised Edition in 1999 at least, but the early setting of 1st Edition and the first few years of 2nd Edition were very good.
The problem is that a successful OSR take on WoD would have to be at least partly reliant on the WoD IP, at least the early material for it.
The original OSR with D&D is largely dependent on mechanics as opposed to a specific setting, which is where a lot of the initial nostalgia for WoD is for, even the pre-metaplot and pre-Revised materials from the early 90's.
Call of Cthulhu was able to develop its own OSR setting because the Mythos is partially in the public domain.
Just going "hurr durr make your own setting" is a half-ass "Some Other Game" cop out that the Goths and Punks who run White Wolf/Onyx Path have relied on to suppress any and all wrongthink
The initial drive for the OSR in D&D was largely mechanical. People didn't like the newer rules of D&D or WOTC's narrow focus on Forgotten Realms, and this came to a head with the release of the infamous 4th Edition in 2008.
The earliest OSR games were mostly generic clones of TSR-era D&D, mostly OD&D or Basic, although the first major one was OSRIC, a clone of AD&D 1E. It was assumed you used the clones since older versions of the rules were hard to find back then, and were often very rare and expensive in the case of early stuff like OD&D, Holmes Basic, or certain early 1E AD&D books.
The earliest OSR games were really meant to be used with either pre-existing modules and supplements from the TSR era or for a GM's homebrew setting.
The idea of the OSR games having distinct settings and lore of their own happened a bit later.
White Wolf's later iterations have been about enforcing a thematic and ideological purity and punishing any attempt at deviating from the metaplot and the pretentious themes of "personal horror", to the point of intentionally conflating the entire genre of horror with the specific theme of "personal horror"
Onyx Path's dreadful output and the god-awful V5 metaplot changes are merely that purism taken to its most extreme, to say nothing of garbage like Monsterhearts or iHunt.
Unless you can somehow get the rights for World of Darkness, or be able to negotiate the ability to pay for a licensed fork of the setting, you can't do a successful old-school take on the game and be able to publish it.
So all you have is shitty "Some Other Game" titles that are even more disgraceful to the urban fantasy and modern horror genres as World of Darkness is nowadays, with none of the success or past glory of the early White Wolf years.
Given the animosity between Onyx Path and Paradox, I'm surprised nobody has tried to raise the money to license Chronicles of Darkness/New World of Darkness from Paradox and get it out of Onyx Path's hands. But that is neither here nor there.