This is becoming an interesting discussion.
How much control should an employer have over their employees life? Assume the employee gets to work on time and does their job conscientiously. Suppose the employer went to enormous expense to get the employee to mars. Are they now a bond servant?
What right does a person have to their own life? What happens if they are fired while working for the only employer on mars?
This is why colonists should arrive with assets that allow for liberty.
Slaves have other people make their decisions for them.