I think the only reason japan still legally mandates that porn is censored is because no politician wants to look like the "pervert" who pushes for it to be decensored and potentially jeopardize their standing and job. The amount of censorship varies from full pixelation that destroys the image, to 1 or 2 lines that don't really obscure anything. Seeing as how you can get away with the barest of censor coverage, it feels symbolic at this point.