People keep calling it NTR because they don't understand the true meaning of the word, most likely due to the fact that they have not taken the time to go look up what the word means and are simply going off of what they have interpreted from how the word was used by others. I spent a few weeks wondering what NTR was and couldn't find a good use of the tern and finally spent about 5 min surfing the web to find a good definition of the term. But most people aren't going to do this.
While the definition I read was a couple pages in length you just summed up most of the entire article in one nice and small sentence. All you need to do is remove basically and point out that the person is to shy or unwilling to fight to get the person back. In fact if there is any NTR in these games it would be more accurate to say that the player is the one doing it, which isn't the case in this game as of the current version.
Of course now that I now what it means, it's starting to make me mad at how many people misuse the term and are complaining for now reason.