That´s different.
Deep Throat WAS financed by a mobster family, and in the 70´s some producers had close relations with the organized crime. But when porn became mainstream (no "prohibition", so to speak), it ceased to be the overly lucrative business it once was, so the mobsters moved to greener pastures of grass (any second-rate drug lord earns at least 50 times more money than Stagliano).
But in Japan, non-pixelated porn is still strictly verboten, so the Yakuza controls THIS part of the biz - and, by extension, a lot of the actresses who agree to go all the way.
In the country that gave us Godzilla, you have the freedom to show a underaged schoolgirls being beaten, tortured and raped by tentacles, but if you dare to show ONE pubic hair, it´s slammer time.
Go figure...