What happened to all the Halo 4 custom games??
What do you mean?
Well the game is four years old, and newer Halos have released so the population will die down. If that’s what you’re asking at least.
Alot of the custom games for Halo 4 received alot of mods and alteration on the 360, it would seem the heightened security has diminished the amount of active players on the xbox one and with a level cap on your SR rating, most players probably felt trapped in a uncompleted product. Not to mention Halo Reach with HD graphics is hard to beat, mainly cause of the “in the trenches” feel that everyone seems to be going for which halo 4 doesn’t seem to have.