Just say there's a new cool app that doesn't have the same censorship as the old ones and people send each other money for posts they like. No tech, no details. They will learn more from being here. "Normies" dont need the under the hood. Send them the best app for their phone. Later you call tell them how they can switch to any app and use different tools all connected. I think #nostr people are too stuck on selling the tech to non-technical people.