I think they already know the guys behind the website. From an article [1] mentioned by [2] :
Documents obtained by TorrentFreak dated September reveal the MPA, acting through legal representatives, attempting to pressure individuals who they believe are important at Nyaa and could have the ability to shut the site down.
...
While emailed threats are still a common anti-piracy strategy, we are informed that at least two of the individuals were personally served with legal documents at their homes. Others were served with similar documents via regular mail.
The Nyaa.si devs addressed those notices described in the torrentfreak article on their twitter back in November:
> To briefly address this, we have no plans to shutdown or quit at this time. If we do choose to shutdown eventually we will make a public database dump for any successor entity to use, we will not be just disappearing like our predecessor site leaving everyone else on their own. [0]
> By the way what the fuck is an "anime cartel" MPA? Do we sell cocaine now in your head-canon? Please limit your fanfic posting in public, it is giving me second hand embarrassment. [1]
Documents obtained by TorrentFreak dated September reveal the MPA, acting through legal representatives, attempting to pressure individuals who they believe are important at Nyaa and could have the ability to shut the site down.
...
While emailed threats are still a common anti-piracy strategy, we are informed that at least two of the individuals were personally served with legal documents at their homes. Others were served with similar documents via regular mail.
[1] : https://torrentfreak.com/mpa-lawyers-are-trying-to-shut-down...
[2] : https://news.ycombinator.com/item?id=25836709