Let’s make a small browser extension that every-time you “come across porn”, it adds it (anonomously) to a public database.
Then Browsers, ISPs and anyone can use that database to fliter porn, investigate illegal content. It’s a public filter database, we could also sell access to it to raise our state’s bank balance.
We’ll call it “PornDb”
I pretty sure that would stop us needing crappy state intervention and… you’d definitely find an army of willing volunteers.