They're simulacra though, its not the real thing. Her own nude form has been a part of visual gags she's done through her art, at her own discretion of course. And the reality is, there's probably been nude 'parody' art or 'fetish' art of more than a few of the individuals in there. These celebrities don't truly have ownership of their forms and bodies, those are the domain of erotic fantasy and speculation and judgement for everyone who looks at them. Kanye is maybe one of the few who can 'profit' off this on such a larger scale against Dunham or any other possible objector's will, but when you engage in this sort of celebrity culture it becomes par for the course. How much of the outrage is because its this video or because Kanye is no longer considered 'trustworthy' or 'nuanced'? Was he ever to begin with?
To say the music video is the testimony to some newfound realized level of misogyny is dubious, 808s & Heartbreaks is just as misogynist, the expressions are just bolder and not the mere castaways of 'bars'. There's a lot to say that Kanye wants to call himself "Pablo", if its after Picasso (who I'm sure he loves, you merely need to look at the cover of 'MBDTF' for that). Was Picasso's grotesque abstractions of prostitutes not in some way misogynist?
Unless the guy says anything though, to call this 'revenge porn' is presumptive to the insidiousness of intent. Kanye is going to naturally be obsessed with Cosby in the way that he feels parallels with Cosby in being a black man who has become vilified both by his own people and outsiders in America, the same way he maintained empathy for Chris Brown when that guy was a kid dealing with national media judgement and the continuous demand for atonement.
And after all, 'Revenge Porn', is what actually happened to Kim Kardashian with Ray J after all, something that made Kim the celebrity she would become. That music video is a lot of things, but I don't know if you can call it that.