Before the last decade (or even 5 years?) the amount of money some of these companies have been raising would have been unheard of and required an IPO.
But if you can keep finding ever bigger investors to give you ever more money...
It's a really weird reality, because typically the worst kind of place to start a company is one with huge barriers to entry that requires a ton of money to get started. Yet that seems to have done quite well recently.
Squashing minimum wage service providers seems to be merely a side effect... these companies can't really make money EVEN WHEN they ignore regulations and exploit their not-technically-employees.