With Mozilla and others, we launched a middle path in Paris: ROOST — Robust Open Online Safety Tools — to build decentralized defenses with open models that reinforce security. Example: fighting synthetic CSAM. Attackers are decentralized; centralized defense breaks down. So mid‑sized platforms (e.g., Bluesky, Roblox, Discord) collaborate on federated threat detection and incident sharing using privacy‑respecting fingerprints. Attacks strengthen the system — like an immune response.