The internet is no different than any other public domain. If you send nude pictures to your partner and they leak it, there is an implicit understanding that it is intended to be private and they can be held liable.
However, the platforms and websites that publish that leak cannot be held accountable nor are they beholden to any agreement between you and your partner. Simply because there is no explicit /implicit agreement outside those two parties.
The same logic applies to whatever material you publish on the web. Once it enters public domain, you've relinquished the control over its distribution. The principle here is that once you publish to a public domain and while you can claim copyright and take down the material using DMCA, as long as the platform complies they are granted safe harbour and you are not going to be able to claim damages especially if you did not commercialize it. Even if a game you were selling were distributed online, it would be very tough to stop or go after platforms that hosted it.
Following the "partner leaked pictures" scenario, the opinion of courts with precedent ruling is that it demonstrates an explicit boundary between the parties involved in the original leak of the picture who are known to each other vs third parties that consume it who have no idea what agreements took place between them. Damages to the partner that leaked it can be held responsible but neither the platform or its audience. Even if they monetized the content, they would not be at fault because there is no implicit/explicit agreement once those leaks enter the public domain.
I don't know why we are getting side tracked with leaked nudes scenario but the gist of it is that only your partner that leaked your nudes are liable. If he/she uploads and it enters public domain and is shared amongst the entire cities spanning the globe the platform and its audience cannot be held responsible because of the lack of implicit/explicit agreement between the subject in the photo and the original distributor.
> it remains a violation of copyright for him or anyone else to post them without your permission, and damages can be claimed.
You can file DMCA to take down the photos and you can claim damages from the leaker, not the people who distributed it after the fact and the platforms that monetized and hosted the content.
Otherwise we would not be able to enjoy websites like xvideos or pornhub, who would take down the photos/videos if requested through DMCA but would not be liable for further dissemination nor will its audience.
Simply said and put: Once you put out content in the public domain or view, you lose control of it, and you cannot put the cat back in the bag. Copyright laws and right to privacy IS NOT going to change this principle.