Why would you think that? Lobbying organizations exist to advance the interests of their members. Their members in this case are businesses. This will restrict the control businesses have over their former employees. Therefore, they don’t like it.

Ironically, it hurts their business overall (unless control of employees is something they intrinsically value).

They are pro-business (and maintaining the rights of businesses to control their labor force), not pro-competition.

Needs a /s.