Suing a game company because their game is similar to yours is no different than trying to say you own an entire genre. With Bluehole’s logic, the creators of DOOM might as well try and sue every MP-focused FPS developer ever. Stupid court case was doomed to fail; they were just hoping they could scare Epic.
On a side note, what developer is dumb enough to sue the company that develops and licenses the engine their own game is running on?