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Honestly, Pixiv was the latest website for artists I would have seen to apply any forms of censoring (outside of japanese censoring law), but I guess I was wrong.
here are their official post :
https://www.pixiv.net/info.php?id=8789
here is what is going to be banned :
・Sexual exploitation of a minor
・Incest
・Bestiality
・Rape (or any other non-consensual sexual behavior)
・Non-consensual mutilation of a person or body part 
yes, that's most of pixiv's content right now they are banning in 15th december
the ban is due to mastercard (once again).
It seems like pixiv is gonna become the new tumblr / deviantart.
I think some artists already left the platform completely.
even if it doesn't directly ban porn, the new rules are gonna throw out pretty much 90% of the content of their own website.
and counting that pixiv also allow ai generated content, even if there's an option to hide such content that people probably don't know (but it actually doesn't work that well anyway), the website is gonna soon be the new deviantart, but probably even worse (because mostly limited to japanese style arts).
this sounds like the end of an era for everything adult content related.