Wanted to solicit some opinions, but what do you anons think about the argument that any female love interest in a harem story has the billing to be an NTR waifu?

After all, even shows that propose polygamy recognize that either the guy can't choose any of them lest it sadden the rest. And the shows that do try to do unironic polygamy like 100 Kanojo start heavily limiting the time that each heroine can have from the protagonist.

Even if we put aside the possibility of writing that the protagonist did choose someone and now a heroine that wasn't chosen gets approached by a bull and have her broken heart and unrequited love taken advantage of so she starts latching to feeling good from NTR sex, that same scenario can happen when there is no clear-cut chosen girl amongst the heroines with the understanding that there will likely only be one chosen in the end.