I think it all comes down to semantics, and the exact definition of "threat". If you define threat as warning someone that you will do something that will nega

I think it all comes down to semantics, and the exact definition of "threat". If you define threat as warning someone that you will do something that will negatively affect them, then threatening to quit absolutely qualifies as extortion, just as Comcast threatening to turn off your internet service if you don't pay your bill also qualifies as extortion. As I said in another post here, Wikipedia's definition of extortion is: ""Extortion, which is not limited to the taking of property, involves the verbal or written instillation of fear that something will happen to the victim if they do not comply with the extortionist's will." Getting your internet service is a negative thing, so and Comcast's will is for you to pay your bill, so I think it fits the definition of extortion here. As do all contract negotiations. In summary, I think these definitions need a lot of work.