The dollar amount doesn't matter. What matters is if that income is sufficient to lead a decent life (shelter, food, leisure time, keeping children in education). Unless you know that, you can't comment on their salary.
If hey he Chinese person is happy with their job, and you're happy with your iPhone, no real harm is being done.
By putting a fantastic piece of hardware in your hand, at a pretty reasonable price, it allows you to be more productive, thus leaving you with more to spend on other purchases. It also enables an entire ecosystem, allowing other people to be productive, and so on.
All these things are infinitely better than the Chinese worker not having that job, and you not having an iPhone.
If hey he Chinese person is happy with their job, and you're happy with your iPhone, no real harm is being done.
By putting a fantastic piece of hardware in your hand, at a pretty reasonable price, it allows you to be more productive, thus leaving you with more to spend on other purchases. It also enables an entire ecosystem, allowing other people to be productive, and so on.
All these things are infinitely better than the Chinese worker not having that job, and you not having an iPhone.