There is a version of early business success that looks excellent and functions as a time bomb. You land a client or customer who represents a substantial portion of your revenue — 40%, 60%, sometimes more. The cash flow stabilizes. The anxiety of early-stage uncertainty recedes. You have the space to build and improve and plan. And then, eighteen months later, they churn, downgrade, or stop responding, and the business that felt solid turns out to have been a single relationship wearing the costume of a company.