Why do companies now need to fill out a subordination contract when recruiting workers? Are migrant workers considered slaves in today's society?

1. That is not an affiliation contract, but a labor contract. This contract is not to stipulate that you are affiliated with the company, but to stipulate in the contract what rights and obligations you and the company have respectively so that you can work in the future. It will be easier to handle when you have a dispute with the company.

2. Migrant workers are not slaves: Slaves are forced to do various jobs without being paid. Migrant workers only do the work agreed in the contract and must be paid. Once a migrant worker no longer wants to work, he can resign and leave. However, a slave is subordinate to his master for life, and even his life belongs to him.

Your idea is too extreme