As of right now, October 26, 2017, I’m unable to find/download/purchase any of the apps in the apple store. If I were to use Halo Waypoint and use the link in the game sections and be reforward to the apple store, the “not available in the US store” message would pop up. I’m just wondering if these apps will be ever available again.
They will be but there is no eta for when they will return. They were pulled due to issues with the games working on newer versions of iOS, as soon as those issues have been resolved the games will return. Keep an eye on the weekly community updates to see if new details get released