These examples do make sense, because you are not required to do any of them. In exchange for the opportunity to rent a car, keep my current job, or vote, I agree to restrictions. Yes, I could find another car company that doesn't have the model that I want, or another job that pays less, or simply choose not to vote. Just like football players are not required to participate in college football to pursue a career in the sport - it's just their best opportunity to do so. In exchange for that opportunity, they currently must be willing to forego certain things.