Ruining Niki's career makes no sense. She's already ready to drop it anyway, having a porn video of her on the internet would just make her dedicate herself entirely to Akira even sooner.
As for Ami being cucked, she's already built a career around it from what we see on her happy endings
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Sekai made sure to gave her a degree on it from introduction to dissertation of "why dad will sleep with everyone but me?"
I think that IF someone's watching it, it's more likely to be someone that wants to see Niki naked? like an Otoha situation again, but so help me god if Otoha keeps doubling down on Akira's girlfriends instead of developing ANY sort of original arc.
Hey, maybe Noriko's watching out of nostalgia lol