You mean I can’t just walk away and declare bankruptcy? Why not? They can force me to lose money?
I can’t run the profitable in town routes and leave the crappy rural routes to someone else? Why not? Amazon does

.
You mean FedEx can force me to take out a second mortgage on my house to supplement their multibillion dollar corporation?
Is that what you truly believe? How exactly do you believe they will enforce anything like that? OTCs? Threats? “Contractual remedies”?
Do you really believe that any contractor is in any fear of any of that anymore?