Yeah, I'm gonna stop arguing with you, because it's getting increasingly idiotic. Between "buildup and payoff" and "marketing" one is a narration technique and one is a process that uses (among other things) said narration technique.
Go on, answer to this post in whatever way you want and be happy to have the last word.
Most of the time, it's not the scanlation group (this is almost NEVER the case despite reader accusations) OR the artist/author/mangaka splitting up chapters. It's the publisher.
Different publishers do it in different ways. Some like to split up a single monthly chapter into 4 parts and post 1 part every week. Some like to split a single monthly chapter into 3 parts and release one every two weeks to build up a bit of buffer to cover necessary artist breaks/vacations. Most simply split a chapter in two pieces.
There can even be a difference in how they are published online versus in the magazine. The break into 4 parts I mentioned is usually just one chapter in a monthly physical magazine. I've seen biweekly Magazines do it both ways--split up the chapter in the magazine so it has content every issue and keeping chapters as a single piece but only including it every other issue.
There is one thing that remains nearly constant for all of these--the full volume release very rarely breaks up chapters. Usually, the only subchapters are extra ".5" chapters.
For this manga, most of the .1s and .2s pretty obviously were a single chapter due to the lack of transitions, splash pages, etc. Chapter 58 is the only one I've seen where it was even possible that they could have been written as separate chapters.
