You and idm both make good arguments, they don't seem exactly the same. Both are reasonable. I'll throw in a third. Although "Being arbitrary and protective about what products you allow people to build onto your own products is not inherently a restraint of trade", perhaps some forms of it should be. Do we have to wait for a form of monopoly control that fits the DoJ's intervention before we fix things that may obviously be broken? DMCA protections aside, maybe its time our gov does take a stand on companies precluding us from doing what we want with something after we purchase it.

Your set-top box perhaps only should be protected if modifying it could cause serious harm to the core service provided, a service that is supposed to be neutral in what it carries. That narrow protection (if it even applies to your set-top box) should most certainly not apply to value-added user apps on a pocket computer.

If a role of government is to ensure economic growth, is it wise to use Apply as the foothold case to create rules to disallow this level of protectionism? Would the PC market have created the level of economic growth it did if IBM had controlled what software could be installed? Is it acceptable in terms of economic potential that simply because companies have the means to control such distribution now that they be allowed to?