Manufacturing industries see labor as fungible. They see pollution or waste as a cost. They seek a legal environment that assures maximum profit and tax regimes which let them keep that profit.
American corporations have been playing this game ever since the first textile mill moved south, and then on to China, India and the Philippines. Every industry does it. There are both positive and negative side effects. Hundreds of millions of people in the developing world have been raised out of poverty in this century, but low-skill jobs in the developed world have disappeared.