Meh, I think the reason for this is that corruption content in a corrupted world (seriously, there is no real effort to have sex because everyone is available almost immediately or rapes you!) is quite boring and makes no sense whatsoever; more so, rape, which I really don't like, isn't frowned upon but a normal state of might makes right, so what is corruption in such a world? Bimbo Azzy was cool and all but how is that any different from normal Azzy? The choices up til now that should change the world around you don't really matter either, and in most cases it just cuts you out of content (which is a big nope), and this is impossible to actually handle because there are too many npcs so for it to be meaningful you should add interactions for most of them.
To sum it up, corruption in this game is meaningless because there is virtually no difference with the normal state.
Another big reason, imo, is that for most of the lifecycle of the project the corruption content has always been secondary compared to everything else, but the format of CoC2 doesn't help much either: your MC isn't really yours but the writer's: the dialogues and the personalities aren't something you decide, they depend on what's written. Frankly, there is no immersion for me because I'm reading a collection of short stories, it's clear that writers want the players to know those stories (and enjoy them) but not to experience them: you have no agency, you don't shape those very stories (which, imo, is the biggest gripe), so the few choices you are left with (corruption) are an empty, meaningless shell.
The game scope doesn't help either: anyone can come and write a new character and then fuck off from existence, which means there are a bunch of one-off characters that add little to the story but increase the workload on the main writers to maintain that content (which is mostly dropped after that never to be seen again) and adds frustration to the player (like me!) because if you particularly like that idea or character, you will never see of them again. And this is one of the biggest gripes: side characters aren't actively maintained because that depends on the writers, which is crazy to think about because why would you add them at all? Either you provide a growth path and stick to it or you don't bloat the story.
To sum it up: there is no point to corruption content in a game where there is the MC has no set personality, there is actually little reactivity and reason to take the corruption route (knowingly, it will 100% lead to dead content and all characters are already corrupted) and the player has no agency whatsoever