I guess I just don't understand the appeal of having Fortnitemares if the cool thing about it is having IPs clashing (I think?), which, inevitably I have to imagine HHN won't have? Since the trouble to go through having those IPs is still an obstacle to deal with other studios. And if they did obtain the rights to use those IP characters, my main thought would be "cool, but then why not use them for a maze?" Unless Fortnitmares will specifically only use the Universal and/or HHN characters from 2026, but somehow, that seems like "eh, so what? I already saw them elsewhere."
I guess it just comes down to "cool and easy synergy where we can kinda do what we want but have a video game IP, but it ultimately doesn't matter one way or another"