Nobody forces you to buy a Ford or a Chevy either but both of those manufacturers have to follow very strict rules about how they make and sell cars.
If our country decides to make a rule about how smart phones should be created, sold or operated and Apple doesn’t like it, they can go and do business somewhere else.
And Tesla? Will they also have to allow third parties to “upgrade” their cars since many of the additional features are software controlled? Why stop there? Kindles? Roku sticks? WebOS TVs? TiVo’s? Cable boxes?