Sure it presents itself as a "revenge story" but... Insert busty moeblob girl, oddly neutral king, and protagonist who seems more inconvenienced by how they don't mind disposing of him after completing his mission rather than mad enough to become homicidal. I mean, think of it not like Keyaru or Raul but more like the hypnosis guy who convinces his bullies to segg him. Either way it will be seen as raw trash by many but shiny trash by the rest.
I see no problem with that, there are many types of revenge porn and this is just one that is more sexual and less violent maybe, not everyone wants the Incel fantasies of Redo of Healer or the milktoast of kicked from the hero party, the whole thing exists to "moral justify" the sexual assault on the vileness princess, some series dont even make that pretense.
Personally I dislike series like Shield Hero that try so hard to create a situation to justify MC turning into a incel that are just hilarious, I like Rance as yes ... he assaults women and have a ton of defects but at least there is a honestly around it, I have no illusions I am looking at this for the lewd and I just find it curious when people complain about it when its obvious whats its about.
Like the woke crowd likes to say, "this wasnt made for you", I dont have to read every series in existent and I have series on my follow list I have stop reading, its just I dont go in the comments and complain about it ... I stop reading Komi for example, still a popular series and its just to me people commenting on how awful a series is ... I just dont understand, if its like when a series have a sudden shift like say a romcom that suddenly focus entirely on side character yuri relationship, sure but something that from the start its obvious what is about ... its like going into a KDF and complain about the lack of vegetarian options.