This behavior of legal loopholes to discount workers should be made illegal. The definition of sub-contractor has got to change and/or have laws/policies in place that actually make sense in a sub contractor relationship. These are shell companies that spin up and exclusively deliver for amazon, they aren't gig workers delivering when they want, they have strict quotas.
It comes down to priorities.
In the US at least, regulators are very pro jobs & job creation.
People employed contributor to society in many ways (eg purchase goods, taxes, lower crime, etc).
Which means, US wants to make it easy for someone to create a company so they can hire a people.
Now if the business that’s created to employee people is a subcontractor for a Mega Corp, the US regulators don’t care. Because again, it comes down to priorities - which is pro job creation.
Note: I’m not anti-unions. I’m just trying to depict it comes down to what’s highest priorities for regulators. And pro job creation / making it easy to create a company, is pretty high on this list.