Cause I saw someone asking in the reblogs and someone else claiming that the Dark-Hunter series was published after The Mortal InstrumentsâŚ.
The first Dark-Hunter book was published in 2002. Whereas City of Bones, the first in the Mortal Instruments, was first published in 2007. And before people continue to defend Clare, remember that she has a history of plagarism in her fanworks.
Also, thereâs this from the initial report of the lawsuit:
 On Friday, Kenyon sued Cassandra Clare aka Judith Rumelt aka Judith Lewis, claiming her âShadowhunterâ series initially used Kenyonâs trademark âdarkhunter.â
  After Kenyon demanded that Clare remove the word âdarkhunterâ from her work, Clare used the term âshadowhunterâ for her protagonists instead, according to the lawsuit. The word âhunterâ was also removed from the book title.
  Clareâs book, âThe Mortal Instruments: City of Bones,â was published in 2007. Since then, Clare has expanded her use of the term âshadowhunterâ despite assurances that she would not, according to Kenyon.
You can find the initial report of the lawsuit here.
Iâve read the first three books (but theyâve been on my reread list for a while) in the series and I can confirm from my recollections that having read through that list? The similarities are pretty fucking damning.
Also, for those who want further reading on the subject of this lawsuit, you can read more here. That contains these two points:
12. In 2006, PLAINTIFF was alerted by some of her distressed fans of the potential publication by CLARE of a work that incorporated PLAINTIFFâs Dark-Hunter Marks. PLAINTIFF demanded that the term âdarkhunterâ and the Dark-Hunter Marks be removed from CLAREâs work. CLARE removed the term âdarkhunterâ and the Dark-Hunter Marks from her work, substituting instead the term âshadowhuntersâ for her protagonist, but removing any reference to âhunterâ (whether âshadowâ or âdarkâ) from the title; the book was published in 2007 as âThe Mortal Instruments, City of Bones.â Despite PLAINTIFFâs continuing protests and continuous assurances from CLARE and CLAREâs publisher that she/they would not expand the use of the âshadowhuntersâ term or adopt it as a trademark, CLARE has persisted over time in expanding her use of the term âshadowhuntersâ from a mere description of her protagonists, first to a tag line on the cover of her works and eventually to a complete rebranding of her works so as to be confusingly similar to the Dark Hunter Series. CLAREâs works are now listed on CLAREâs website, âshadowhunters.comâ under the category of âCassandra Clareâs Shadowhuntersâ and include the series of âMortal Instrumentsâ novels along with âThe Infernal Devices,â âThe Dark Artifices,â âTales from the Shadowhunter Academy,â âThe Bane Chronicles,â âThe Last Hours,â and âThe Shadowhunterâs Codexâ, each a âShadowhunter Bookâ (and collectively, the âShadowhunter Seriesâ).
13. The Dark-Hunter Series and the Shadowhunter Series are so similar that CLAREâS own publisher mistakenly printed 100,000 copies of a Shadowhunter Book referencing the DarkHunter Mark on the cover. Upon written demand by PLAINTIFF, CLAREâs publisher destroyed tens of thousands of the Shadowhunter Book that contained PLAINTIFFâs Dark-Hunter Mark on its cover. Despite the destruction of tens of thousands of copies of this Shadowhunter Book, thousands of Shadowhunter Books including the Dark Hunter Marks on the cover have now been sold and substantial commercial confusion has resulted.Â
Bolding is mine for emphasis.
And for those who want more, hereâs the fanlore page for Cassandra Clare.