Apple wants a piece of the pie from EVERYONE downstream. They'll go to great lengths to make sure they're always at the door, collecting.
They can very well deal with and clean up the mess anyone makes upstream. "Apple and <some supplier that almost exclusively supplies to Apple> are not the same" line is pretty much trolling at this point.
Wistron isn't "some supplier that almost exclusively supplies to Apple". They also manufacture electronics for Microsoft, Dell, Lenovo, Motorola. Originally, they were Acer's production arm. Lots of things about how workers in the supply chain are treated is very wrong, but if you accuse others of trolling, you'd better get your facts straight.
They can very well deal with and clean up the mess anyone makes upstream. "Apple and <some supplier that almost exclusively supplies to Apple> are not the same" line is pretty much trolling at this point.