I'm easily the most outspoken basher of the "NTR haters" in this thread and I myself hate netorare with a white-hot passion. The problem is that particular pressure group insists things that are not even remotely netorare should be tagged as such which, given that it is such a divisive genre as you yourself demonstrate by calling it "disgusting", scares away potential supporters who would like the game if they didn't skip it because it was falsely tagged as netorare. It's not like the netorare aficionados will support the game once they play it and figure out it's not what they were looking for, just got tagged as such because somebody pitched a fit. That's what happened with this game and, if I had stumbled on it like a week later than I did, I would have just skipped it because of that tag. In fact, it was my experience of playing the game, enjoying it, and then seeing that tag added to this thread because somebody threw a tantrum that made me realize that tag has been rendered useless by a lobbying group who want it to mean "woman in the game so much as looks twice at somebody other than the player-insert character, therefore netorare" so they can have a single tag to filter out any game that threatens their fragile egos. And that is something which absolutely should be pushed back against every time it comes up.
Netorare is a specific genre about wallowing in misery because somebody more manly than the MC stole his girl away. It is not that a potential love interest has an ex that she's on friendly terms with. It is not that a potential love interest isn't a virgin as somebody infamously threw a fit about in one of the momcest games because that meant MC's dad had cucked him by...conceiving the fucking MC. It is not that the MC is fucking women who are also fucking others because there's no expectation of monogamy on anybody's part [e.g. this game]. It is not a harem game where the members of the harem play with each other (I've seen people freak out about girl-girl scenes in harem games and insist that's netorare somehow). It is not a story about the MC moving on after a relationship that ended because his ex cheated on him. It is not polyamory. It is not swinging. It is not hotwifery. It is not stag/vixen. It isn't even cuckoldry, despite that being the English word commonly used to translate it, because in cuckoldry the "cheating" partner doesn't leave, just carries on having affairs in front of the cuckold/cuckquean, who isn't really heartbroken because they've got a humiliation kink that's being satisfied. Games catering to each of these will have radically different stories and content designed to scratch radically different itches, and trying to force-fit one label onto all of them just succeeds in making the would-be umbrella label so vague as to be useless, and I don't think it's coincidence that the people that hate all of these picked the most divisive of the labels to try making into the umbrella term.