I don't know where you guys are roaming but I haven't seen a single pedo post since December when I came here 🤷. Nostr app devs bear the same responsibility a browser dev does. It's all you on how you're using the browser. And probably pedo posts are gov agents fishing 🎣...
No, Nostr app devs bear the same responsibility that app providers share. Snort for example is a social media platform. Anything shown on it is legally their responsibility. The law won't care that the owners try to claim it's just a protocol to get around having to take responsibility.