The VCs do everything they can to drive up the valuation, except make money. They then sell their shares to the public markets for an incredible profit and let them deal with the problem of actually making money.
I fear venture capital (and Silicon Valley) is much more about value extraction than value creation these days. I am still somewhat young so I have a limited frame of reference - maybe it was always like this.
Obviously you can find examples to support either side. Amazon and Facebook weren't the money making machines (for all the talks of Amazon not making a profit, AWS clearly does and their free cash flow is insane) they are today when they went public. But there are far more companies that didn't turn out that way.
Travis Kalanick was very clear that Uber could not survive without self-driving cars. And that doesn't seem to be panning out.