Are you referring to unicorn startups funded with venture capital money? Most of those companies don't have to worry about being profitable in the near short term (<2 years). Snap Inc. raised $2.5 billion dollars or so and has around 300 employees. I'm having a hard time believing a company that raised over $2 billion dollars, has 300 employees and doesn't have to worry about turning a profit will run out of business if they paid their software developers market rates.