This argument is always being made on HN and is always wrong. And it becomes more wrong every time it is repeated.

Because with that logic, every company in the world is a monopoly because every company in the world has their own niche and their own products which are different from others.

> Ford isn't only selling cars with Ford motors inside.

Ford would never sell you a car with an engine in it which isn't from them.

> They also don't prohibit you from taking the engine out of your Ford and putting it in a Chevy or vice versa.

Apple doesn't prohibit you either from ripping out the motherboard from the chassis of whatever device and putting your own stuff in there. People change batteries etc.