You have the wrong information. "Prudes" doesn't care about morality, they care about money. And payment processors restrict their terms of use, which in turn reflects the publisher's rules. At least that's what I heard.
Was it? I have no idea, all I know is that in the devlog Ocean wrote that two of them are now adopted. I don't think that changes much in i-matter, because whether they are adopted or blood relatives, they are still related, and that's against the TOS.
I know, right? But that's what the developer wrote. And if they're adopted, they'll likely take their adoptive parents' last name.
Although no one said they were adopted by Zanes