It’s a simple enough solution in this case. They are performing the work of employees, so for all intents and purposes, they are employees. They are directly interacting with US customers at a physical location within the US. Their place of work is that physical location, even if they are not physically present. They need authorization to work in the US, and the minimum wage laws applicable to that location applies to these workers.
All that is missing is the lawsuit under existing labor laws, which they will probably lose.