I am not sure which problem you are going for but if they have porn of a person that didn't consent they can just get it taken down. Pretty sure PH doesn't hold the rights to the videos. The right holder (creator, star, ..) can have their content removed anytime.
In actual cases of exploitation the victim is not always the technical rights holder and there are many reports of people who inform Pornhub of being in a video they do not consent to and it not being taken down.
I would argue that Pornhub is trying though, whether it's their best effort I don't know.
