How does “I want x feature for $y or I terminate the contract according to our terms” bring contract law into the equation. Most often you have a single person

How does “I want x feature for $y or I terminate the contract according to our terms” bring contract law into the equation. Most often you have a single person in the big org as your champion. If they leave, you leave. There are many ways to be their bitch. Many, many ways.