The precarious service sweatshop platforms are platforms for racial discrimination.

This results from making users give their names, then allowing lots of people (most of them racist, at least unconsciously) to accept or reject each user.

Please don't use the word "sharing" to describe what these platforms do. What they do is a kind of business, and "sharing" means cooperation that isn't a sale.

"Gig economy" is not incorrect, but "precarious service sweatshop" explicitly states their principal wrong.