I mean Corrupted Kingdoms, and the reasons for the accusations were not that simple. At the time, Zimon was using models which were essentially the same, or only slightly different, from those from Corrupted Kingdoms. The theme was extremely similar, and the story followed a very similar premise. This has since changed, and Zimon has found his own ideas, which honestly are pretty good; I'm not here to say his game is bad or that he's a hack, his stuff is obviously good otherwise I wouldn't be asking whether it's worth playing again. Personally, I really think that Zimon was "copying" Corrupted Kingdoms largely as a display of admiration, and anyone who claims he was doing it as a thief is naïve. However, his reaction to it was not just childish, it actually threatened the livelihood of another person over an extremely petty and insignificant disagreement. A person who is able to do that, and who from his own messages here can be clearly understood to be unstable, is not at all beyond doing any one of the things he was accused of doing. Mind you, this on top of all the hard evidence that was provided.
Bottom line is, Zimon is an unstable, insecure and petty individual who consistently attempts to inflate his own self-image while denying having done anything wrong. Is there a need to do it? No, his work stands on its own and he has plenty to be proud of, I would certainly rate his game in the top 20 in the renpy adult VN community, maybe top 10. But he does do these things, and that's why he's persona non grata around here.
Edit: Also, just to be clear, I recognize that the dev for Corrupted Kingdoms had technically stolen the models he was using at the time on his game, and for that he was at great fault. There's no denying that. However, the way Zimon used that to take revenge was arguably worse than the theft itself: one involved malice and the other didn't.