Actually, the subcontracting is done to enable the companies to have products to sell. Had they not found manufacturing subcontractors elsewhere they would have been out of business. No one would buy their overly expensive products.
The concept of neo slavery is a joke to young workers earning a good living in China making stuff rather than starving in a rural village.
It is called competition.
Competition between fellow Americans in the USA is good and should be unregulated and promoted. Competition between US citizen and chinese coolies should be illegal. We export wealth and import poverty. Tariff is not a four letter word.