The major difference is (1) The laws are designed to eliminate choice and freedom to pursue other jobs for the people being placed. (2) "Staffer" company is a

The major difference is (1) The laws are designed to eliminate choice and freedom to pursue other jobs for the people being placed. (2) "Staffer" company is able to take their 50% or more cut from their salary for entire decade or more every single month. Imagine if you were running staffer company with this business model where law says that workers can't leave the job you placed them and you get to pocket major part of their income for decade or more. Technically sure they can leave your employment but practically they can't because they still get paid bit better than their home country although much less than prevalent wages in US even after staffer takes his 50% cut.