So, why no one is talking about this
... because what you said is not true and heavily pov.
You claim something has become the norm and commonplace. That would mean all the popular and new games would feature it and devs would have plans to make such a game.
Similar to how horror is the norm. Just look at the page one of popular. Almost only horror games. Oh wait, it only is on Itch. On Steam it ain't so. I wonder why. Oh, maybe because Itch is an indie game store. It is per definition not mainstream.
Steam has adult games too, you know. Even if every single game on Itch were such a game as you complain about, it would not make a dent in the popularity of mainstream adult games. What you say has no connection to objective reality. It is your pov.
But maybe it is true for the adult indie game sector, as seen on Itch? Are those games as popular as you claim? We should see them overtake page 1 of popular ranking, just like horror does.
Do we see this? No, we do not. Therefore what you say is not true.
What you talk about is games with multiple males. Aside from gay games, those are shunned in popularity. They get negative comments and are rated down. They have their audience, but it is not mainstream. And this has not even anything to do with gang rape.
The "norm" if you want to call it that way for a genre that has a multidute of nieche interests, is a single male character that gets lucky with all the females. If other males are to be seen, they have no active role. And apart from kinetic visual novels, the game play of such adult games consists of the player working for it, not simply taking the women by force.
Itch is a place for indie games. This means you will see a lot of games here, that are not elsewhere for a variety of reasons. This includes them not being mainstream enough. Which accounts for horror games being so popular. They are the popular of the unpopular, so to speak.
I'm not one of those who think that fps and video games like call of duty make you violent, but concerning these games made and played by crazy people, there is reason to ask questions.
You make it very hard to believe that, what with belittling all the adult game players and developers alike. People like not being called crazy. Or being called murderers for playing CoD.
Concerning the onyx game, you do realize that this is a beat em up and your avatar is the girl and when she is not losing, she beats the crap out of the enemies? Probably not. If you dare visit an actual adult site, you can find gameplay videos of the game.
You better not look up what a fatality in the Mortal Kombat game series is.
In addition, it is almost impossible to find a nsfw game that is pleasant to play today and where you don't have to spend 500 euros per month to progress.
What the, how in the, I cannot even, what?!
I do not know what you consider pleasent in a nsfw game, but you will not find any of those money sinkholes on Itch (ok, technically, some might have made an advertisment page here, burried in the low end of popular)
https://itch.io/games/tag-adult/tag-otome might have some games that will not disgust you. But being a straight woman, I shall assume that you do not like to see boobs in particular. And https://itch.io/games/tag-adult/tag-female-protagonist have a tendency to include lesbian scenes or put the protagonist in situations you probably do not like.
After playing and uprating game you like, try recommendations and the related game buttons.