Are you implying that startup success in America requires exploitation of workers? I don't think most people would consider the management of early employees at successful startups to be "exploitative". Most of them are heavily incentivized.
There are specific issues with the worker models of Uber et al, but that's an orthogonal point to the general formation of startups.
There are specific issues with the worker models of Uber et al, but that's an orthogonal point to the general formation of startups.