[rdiddly]

I'm absolutely not addressing who's an employee and who's an independent contractor. That distinction isn't needed or useful. Cleanse it from your mind for a minute.

Also, they wouldn't pay GST; they would collect it from customers and pass it on to the government.

The question is what entity provides the service? In name, it's Uber. Do you take a Joe Johnson? Or do you take an Uber?

The point of contact is Uber also. You contact Uber for a ride, not Joe Johnson.

What entity sets the price? What entity collects the money? Uber.

There are some differences with Amazon and Etsy, but in general I think for this purpose if you partner up with a big company, you are not necessarily a small supplier anymore.