On another note, thinking about the Dead by Daylight game.
I think to summarize my thoughts on this, I feel like its worth making a general guideline of what really works for this setting.
Inherently, each setting has a certain level of
Scope and
Implications, representing how it affects the setting, with
Scope representing how widespread the situation is, and
Implications representing how its basic features affect the world as a whole.
Some settings, like
Friday the 13th, have very specific regional
Scope and
Implications. Jason doesn't really wander around, and him being revived by first mad science then happenstance doesn't really affect the rest of the world, so its perfectly fine to include.
Others, like
FNAF, have a regional
Scope but global
Implications, due to it introducing advanced animatronic technology and Remnant into the setting. This certainly has implications that can't be ignored, but it still gives room for other settings to work in. Hell, I would argue even
Lovecraft's work and my previously suggested
World of Horror (Video Game) setting work well for this, as the apocalyptic threats remain out of focus and are generally unable to do anything unless something REALLY bad happens.
Others still have a global Scope but very weak Implications.
Resident Evil has a virus which very much has the risk of infecting anyone, but also has an organization that deals with these outbreaks, so they wouldn't regularly affect other settings, though you certainly could have it interact in a self-contained manner.
The problem comes with settings with global
Scope and global
Implications, settings like these cannot be ignored and have to be accounted for in every single setting that is added within. This is where the previously mentioned
Tokyo Ghoul and
Chainsaw Man live in; anything at this point begins to dominate the setting, so its best to exclude it.
You can mitigate things in the last category to make it work.
The Last of Us can be canon, but it doesn't wipe out the U.S. because other settings have ways to deal with the outbreak to make it work.
This leaves
Dead By Daylight, which is in the latter category. The Entity has literal multiversal and throughout time
Scope and
Implications, as it is far more active than any Lovecraftian god and does more than anything as well. This is a literal entity that took an entire planet into its realm with the work of a single serial killer and some timeline shenanigans. Its very presence warps the setting around it, and there would inevitably be some cultist who is capable of summoning it to doom the world. Its very presence would force the setting around it, and it is also unneeded because we are already bringing all the horror monsters together, separate from it.