So, some context as to why this happens: the US does not give a fuck about how old someone is if they're involved in the production of csam, nor does it care if it was voluntary. This means that, in the eye of the law, a teenager sending nudes to their boyfriend is just as much of a pedophile as the man shooting child porn; and their boyfriend is just as much of a pedophile for viewing and possessing them. I'm guessing that OP likely posted this after reading an article like this: https://apnews.com/article/child-images-police-columbus-cf377933b5be55297cf88c923b8f0b92
It doesn't stop there though. I have been told to never, ever try to submit evidence to the FBI of someone being a child predator. The reason for that is because the FBI does not give a fuck. They will prosecute you as a predator, even if you're just trying to do the right thing. Combine that with the fact that an accusation of being a predator is life-ending, even if you're found innocent, and it encourages people to destroy evidence and stay quiet.
Finally, if there's any csam on your PC, whether or not you're aware of it, regardless of whether you received it voluntarily (like temp browser files from accidently viewing a hijacked website with cp on the page), you are automatically a pedophile in the eyes of US law. This is especially destructive when it comes to a video, where each frame is counted as an individual piece of csam. This means you can potentially be taken to court for hundreds or thousands of pieces of child pornography because someone embedded a clip of cp in a movie.
Fuck pedophiles, but the law needs an overhaul. In addition to the number of people who got put on the registry as kids, there are probably a lot of people who've gotten fucked because they were legitimately trying to do the right thing.
Edit: I could be wrong about this, the law may have changed or I may have been misinformed. It's been a long time since I was told this, but it's in line with the article I linked and the one OP linked, so it's unfortunately far too believable to disregard. If there are any legal experts who can counter this, please speak up.
Edit 2: someone has replied telling me that I'm at least partially wrong, which I'm happy to hear. Still, stay safe. It seems like using csam to fuck with people, especially those in marginalized communities, is becoming more popular. Report it, clear your cache and/or temp files directory (whichever is associated with the program you had the misfortune of viewing it through), and move on. Or, to put it another way, treat it as if you accidently picked up an unshielded bar of plutonium by the side of the road. Put it down, leave the area, report it to authorities, thoroughly clean yourself off (then maybe go to the hospital).