The first episode of Plain Strata. This June, the most capable AI ever opened to the public went dark for the whole world, three days after launch, because of one letter. The United States Commerce Department ordered Anthropic to cut off every foreign national, and to obey a rule about some people, the company switched its model off for everyone. That is what an off switch looks like when someone else is holding it. In the same week, on a network no company controls, a 19-megabyte model that runs on an ordinary laptop beat the giants at one task: a model with no off switch to pull. We take both apart in plain language: why the cloud is really a building with one door, how a tiny cryptographic receipt lets you check work you never ran, why a deposit keeps strangers honest, and the honest trade where pulling the switch cuts both ways. No prior knowledge assumed. The research, writing, and editorial decisions are human. The voices are AI. Decentralized AI, layer by layer.