Halo Reach Infection custom games

Halo 5 doesn’t have an infection playlist at all and it doesn’t look good for those of you who are waiting for one to come out in Guardians. Now, halo reach… did it right. Love playing infection (living dead is the playlist) on it and definitely enjoy playing custom infection games with people on my friends list. However there are fewer and fewer people playing custom infection games on it anymore. which sucks majorly, IMO. If there are those you out there who still enjoy doing this on halo reach or even the MCC, hit me up with a friend request and invite me to join when you see me. Too many people set their privacy filters on with their profile so i’m unable to either see them online or even join them.
Why is there no infection games for halo 5 yet?