It's just hard to take down anything from the internet. And you can never prove that there aren't more copies out there. Removing something is a luxury for people who can afford a team of lawyers to send DMCA requests everywhere, and even then...

The other major issue is that the main method of takedowns is copyright law. But the owner of the copyright is the person taking the photo. Which means that in some cases, your ex might actual own legitimate copyright on a nude photo of you, and they can spread that wherever they want.

Now, I'm not saying this to advocate for a major clampdown or alteration to that or anything. Copyright being owned by the subject would be a huge mess, and it doesn't solve the takedown problem. And ultimately you come across the bigger issue of solving these problems without basically having full control and cooperation of the internet. We're at the point where reported photos can be automatically removed and filtered on some sites, which is a little scary, but how much further does the control have to go?

Chasing revenge porn down is a bit like preventing terrorists from hijacking a plane: you spend more time confiscating nail clippers than you do bombs, and even when you do catch someone, it was probably three of eighty sent through to test if the screening process works. In short, you're looking at a massively invasive system that might cut back on the amount of revenge porn on the internet by a small percentage.

If my house was robbed, I'd want the police to care. But if someone came by, took something that was legally theirs, and then made a bunch of copies of it, it's hard to justify the police going after every duplicate when the only crime, apparently, was Breaking & Entering. The laws aren't screwed up because we want them this way; they'res screwed up because the situation falls into a gap between copyright law, photography rules, the way the internet works and is enforced, etc. And there's no easy way to extend any of those into that gap without screwing one or all of them up. It's easy to agree that having nudes of yourself out there sucks. It's hard to find a solution that actually works. And the number of people who want to go full-Drug War over revenge porn must be oblivious, because I swear they're the same people who were just ranting about the DEA and the TSA five years ago.