Edit: (I think I should be clear, the reason I can get mad at this is because it is complete fraud taking Yanfly and Moghunter, and other, plugins, that are for the RPG Maker community and nicely been given away for free, and then try to fool me into spending a huge sum of money from someone who stole them. It's just terrible at every angle you look at it. So sorry if I sound heated in my comments, but yes I'm annoyed by it as I'm sure many of you must be.)
I can't really comment any more then knowing something should be able to be done in this situation and it's quite irritating that Fiverr seems to be ignoring it entirely.
However, even though I don't use Fiverr, I'd assume a lot of people on there do honest work for the prices and aren't fraudsters. So I wouldn't give advice telling everyone there is not any honest people on that site, probably a lot are.
Still, this case can't be the only fraud case on Fiverr, and if they do nothing about them, which it looks like, it is terrible.
I know it's not as simple as what
@definite_lee said, but in Yanfly's case, Yanfly has been able to stack up plenty of evidence for the case. I mean you can see from the images they copied a lot of the code in all those free plugins, etc. (Sorry saying more would just get me mad).
Why can't they do more other than just ignore his DMCA? Ignoring it completely is a terrible approach to it, unless I really am missing something significant?
What I am trying to say is, there should be some sort of process, even if it's not simple, and I know that small part of not being super simple is understandable, but sounds like, from this, Fiverr won't care enough to go through a process of any kind. I can't see that as being acceptable? Huh?