Underneath the costumes, the same few models did the work, and their American record is now long enough to audit. This article reviews disruption models in America by results: the use cases where the playbook actually ran, the benefits and damage it distributed, and the long-term openings the next wave is already exposing. Use cases: where disruption models in America actually ranTrading went first and furthest. Commission-free models forced an industry-wide repricing inside three years, and the surviving brokers rebuilt their economics around flow, margin, and cash sweeps. When the visible fee died, revenue moved to order flow, interchange, float, and data, places where the customer’s cost is real but unpriceable at the point of use.