Re: Apple are responsible for the actions of their sub-contractors
No Apple is not. Apple has chosen suppliers to create its goods, those suppliers do not become part of Apple and remain free to do whatever they see fit to perform to the clauses of the contract that has been signed.
If the suppliers and their sub-contractors employ students that they do not pay, bring in scantily-clad ladies for the nightshifts and host regular cock-fighting sessions to boost morale, Apple is not responsible for that.
Apple is, however, responsible for continuing to use said supplier under such conditions. And I'm sorry, but paying students less than regular workers is a time-honored practice in many parts of the world.
It is also somewhat less important in my view than the subject of child labor.