It's completely backwards that scanlations of chapters are up so quickly, but the master race has to wait for whole volumes to get uploaded.
Most of the time, the stuff just gets scanned and sent off to a group who then translate it and post the translated chapter.
Japanistan cracks down on piracy pretty hard, so raw uploads on Japanese sites get scrubbed pretty aggressively, and hosting it on a western site is pointless because the entire point of a western release (even if unofficial) is to translate it so people there can read it.
This is when you realize you should have learned Chinese instead.