The thing is, NTR has been given this narrow definition because the way people write it is so narrow. There is no exploration or experimentation in how NTR can be less shit. Not all NTR has to be a tragedy. For example, if a man's wife is raped and then he and his wife team up to destroy the rapist life and succeed, getting him disgraced, humiliated, and pretty much ruin the rapist's life, while the husband and wife go on to live a long happy life together. That is technically NTR.
This story is NTR, it just isn't the NTR people are used to. People are used to NTR being the same dickhead stealing the same stupid girl from the same spineless coward. This isn't that shitty cookie cutter story, so people aren't sure what to make of it.
"An NTR story that results in a harem for the MC? Is this possible?" Yes, yes it is.
I haven't played the game yet (I will), so point out if I missed anything.
From just the OP, the wife shares the MC, so technically there is no netorare aka stealing, which the tag rules define as ntr.
And what you explain is exactly what I mean, NTR is an abbreviation, but there are always misconceptions behind the meaning, one example being that most know NTR just as netorare, like this site uses it, but it actually also includes netori and netorase, which have a different meaning.
What you're suggesting doesn't make sense, main character and protagonist are the same person, if you control female character then female character is both - in netorare just has a boyfriend to cheat on. Also, according to the rules you've posted technically ALL of those games are mislabeled as NTR (since boyfriend is cucked, and he's not the MC):
https://f95zone.to/latest/#/cat=games/page=1/tags=258,392
Netorase means literally "voluntary netorare", it means the cucked character wants to be cucked. Therefore it is a subgenre of netorare.
I said "as if", not that it actually is the case. I said it just as a guess for why people tag it for most games even though technically it shouldn't apply. I personally don't care that much about it so I don't point it out, I don't play most of those games anyway so I have no reason to go into their threads (I just saw this game in latest updates, it just depends whether I check a game out or not, so it just happened that I checked this for some reason).
And cucking is not stealing, those are different things. Netorare and Netori are about stealing a love interest, not about cucking. Cucking is a sub-genre. And like I said, I don't know what netorase acutally means, just that it goes into the "direction" of "sharing someone". That also doesn't really sound like cucking to me.
Edit: Well, I am not used to the word since I avoid it, but I think there is a difference between just sharing someone and actually cucking someone.
Edit2: I don't want this to escalate into a heated discussion (there have been already enough anyway). I just stated my opinion about it, what I understood from what others said, and what the tag rules define. With this I won't say anything more regarding the topic of what NTR means.
