There are legitimate reasons to allow restrictions on what can be done with subsidized devices which are still bound by a service agreement. Subsidized contrac

There are legitimate reasons to allow restrictions on what can be done with subsidized devices which are still bound by a service agreement. Subsidized contracts come with early termination fees and require a credit check. Unlocking was legal for years. Was there a significant problem with people unlocking phones, breaking their contracts and getting away with not paying the fee?