Can someone explain to me how assembling iPhones at Foxconn is somehow worse than, say, working at a checkout, or flipping burgers at McDonalds? Except for how

Can someone explain to me how assembling iPhones at Foxconn is somehow worse than, say, working at a checkout, or flipping burgers at McDonalds? Except for how Foxconn pays more than 3 times the local minimum wage? In fact, Foxconn's salary of $700/month is beginning to sound close to minimum wage in america, and believe me, $700/m in china goes a lot further than it would in the USA.