Something i noticed is that FNAF4 is actually pretty good for speedrunning even though the other FNAF games (that are speedran by some people) aren't, but that game still has no runners. It is actually pretty hard and skillful to get beat all nights one after another, and there is actually a way of skipping 2 hours of each night (Fun with the plushtrap, a timing based minigame that gets harder each night, that can either be done very fast, very slow or lost, and that can only be done once each night). There are also story based minigames that also need optimization and even with a glitch that allows you to get somewhere you are not supposed to. Why has no one ran it yet, and is anyone up for the task?

Because maybe no-one has decided they like the game enough yet to run it. The game is only very recently out.

Plenty of people could be up for the task, but more importantly, if you think the game is good to be run, why don't you run it yourself?