Not quite. There're 2 type of netori as far as i can tell. The first is like you said "MC is a single/bachelor/playboy who steals women away from their husbands", probably by underhanded methods such as rape/blackmail/hypnotism/lies/manipulation..."
In this case mc is evil.
The second, less popular, my favourite type of netori is when mc cuck the bad guys, seducing their wives/girlfriends just by being a better man, no underhanded craps involved. In this case mc is either good or neutral.
Of course that make no sense. I don't think i mentioned anything like that. I just said that i like netori in general.
Not entirely true. I played Netori games in which the girl is in a toxic relationship with his husband. If anything we are heroes for cucking that fucker.
Personally I have never seen or played any Netori like that nor have I heard of their being more than 1 type of Netori unless you go by that ridiculous VNDB A/B/C crap.
From what we can tell from gameplay so far the game is centered around the girl, I dont know where this idea of the MC having such a role came from but its seems to me like he is purely their to drive the narrative of the wife. Then you add in this tweet from Technobrake from 2 days ago;
"やっぱ主人公は一途なぐう聖に限るよなぁ~"
Translated from Japanese by
"After all, the protagonist is limited to the holy one"
So im not sure where people are getting the idea that the husband is gonna be some type of sex beast, the game is called Nymphomania PRIESTESS, not Nymphomania HUSBAND.