In order to work for someone (whether it be full-time or as an independent contractor), you usually have to sign legal documentation stating that you will be working for your employer. That documentation is also a safeguard for the employer, because it prevents workers from legally disputing the employer's policies, which you are literally signing to agree with.
Maybe you are misunderstanding me.
In order to work for someone (whether it be full-time or as an independent contractor), you usually have to sign legal documentation stating that you will be working for your employer. That documentation is also a safeguard for the employer, because it prevents workers from legally disputing the employer's policies, which you are literally signing to agree with.