That's helpful if they live in the same country, can figure out who the 4chan poster was, the police are interested (or you want to risk paying a lawyer), you're willing to sink the time pursuing such action (and if criminal, risk adversarial LEO interaction), and are satisfied knowing hundreds of others may be doing the same and won't be deterred. Of course, friends and co-workers are too close to you to post publicly when they generate it. Thankfully, the Taylor Swift laws in the US have stopped generation of nonconsensual imagery and video of its namesake (it hasn't).

Daughter's school posted pictures of her online without an opt-out, but she's also on Facebook from family members and it's just kind of... well beyond the point of trying to suppress. Probably just best to accept people can imagine you naked, at any age, doing any thing. What's your neighbor doing with the images saved from his Ring camera pointed at the sidewalk? :shrug: