People posting illegal things on line will get caught by the law, I hope we all can always post free and assume the consequences if we are doing stupid shit.
Discussion
If someone post someone's underage photo online, there should be power to remove it. Law enforcement can take a long time to remove inappropriate content. Speaking from someone who used to do web hosting technical support and safety.
There is already crazy shit going on on the dark web for years.
But if you want to start a law enforcement on Nostr to protect kids, go ahead man, I would support the persecution of that type of activity.