But that's not what the discussion is about. Frigidaire doesn't try to limit you to only putting stuff you bought at Walmart into their fridges.
Unless you want to legally force every company to surrender their source code (which I enthusiastically would support), there's no legal basis for Apple not being able to have their proprietary feature phone locked down.
Though if you'd like, you can look at Keurig, which does limit what you can put into it to "only Keurig products" or one of the millions of other things that limit what you can put into it.
Whatabout...