If it was because of the Unity charges it would take a special kind of moron to continue using the same engine that brought about their downfall in the first place.
Yes and as far we know it was simply a rebranding since Illusion was owned by a parent company, its the same company really just with a diferent name.
I still think it's because of the repeated releases of very, very similar products that did it, but there is little concrete information about what really happened.
I dont think that was the case, its true Illusion is no longer the company that "experimented" as heavily as they did if we can call it that in some cases, after all Ai Girl was pretty much AA with crafting/building system that was the rage at the time, VR Kanojo was a VR game that was also the rage at the time ... its just they defaulted back into Koikatsu and the diversity of their titles was gone and in same there was a regression (but thats typical of gaming these days), they abandoned their "single player" games of their earlier times, Sexy Beach 2 and 3 characters were from those titles ...
I think their comming out with KKS and HS2 was more of a attempt at getting a influx of money by being fairly safe choices, its true we dont know and this was simply the parent company deciding to lose the Illusion brand.
I wont be sad if the Unity team finally shot themselves in the foot and goes under. It's been a scourge on game development for too long as it is. I know many people don't mind it but I'm not one of them.
God I hope not because then the only off-the-shelf engine you would have is Unreal Engine and do you want Tim Sweeney to have the game industry by the balls? Even big developers rather grab either UE or Unity that build their own engine and then we have the case of EA and Frostbite that was mandated no matter what game it was and was simply unsuitable for certain games, one of the major causes of the trainwreck of Mass Effect Andromeda was due to then having to use it, as much Unreal is modular and that is a lesser issue, I still dont trust Tim ... expecially after all the shit he pulled over the years to have that much power.