Compensation is for ... emotional stress? breach of contract? breach of trust? breach of faith? Loss of future (but illegal) contracts? Pretty much anything EXCEPT drop in sale numbers. Because sales is not of concern to idols, only for studios and retailers.
Without having read any, I'm willing to bet uncensored footage being leaked/published is a serious breach of contract for any performer's deal with the studios, for which they may seek compensation.
If it's not about money, clearly, I wonder why is it a big deal for the girls. We can now see their pussy with pixels but nothing more. They don't want the world to see their pussy ? Don't shoot JAV. It's funny that a girl is willing to shoot naked and have sex on camera but the most important thing is to blur. It's not that blurring will erase the fact that the guy put his dick into her vagina.