That’s already true, for any device that you create, you should rule over it 100% and no one should have any say over what you do with it. Heck, if you want to create, say, a mobile phone and OS, WITH an app store and restrict the folks from buying your device to ONLY using that app store, I say GO FOR IT! No one should have any say on how the device YOU create can be used other than you.
And, if anyone that bought your device knowing about the limitations, comes along and tries to tell you, “Hey, I want to buy stuff from other app stores,” you should be 100% free to tell them to pound sand if that’s your response of choice. There should be no requirements to listen to anyone other than, maybe, your shareholders if your device production company is public.