How would that help those people though? Presumably these people are not forced to work in those factories, so just moving their jobs to robots in America isn't

How would that help those people though? Presumably these people are not forced to work in those factories, so just moving their jobs to robots in America isn't going to help them. It would only help them if the premium is going to the workers (and you could probably make do with less than $100: assuming that the workers get $5 of the $6.50, increasing the price of the phone by $100 and giving it to the workers would give them 20x additional salary).