I did not notice anything wrong with pixiv as they always harras few random artists from time to time wbo do not do proper censorship I also faced some problems there but it looks pretty random. and I suspect that you get inspected once you gain too many followers or maybe when you post certain amount of pictures
If you are interested in written stories Pixiv has no censorships of any kind

exhentai prety much do not allow any 3d unless it somehow gets unnoticed.

The only site which is free of censorship is baraag.net