What country are you thinking when you say that? It doesn't sound like the US. Through the zero-interest rate era they've been absurdly tolerant of companies offering no- to little- returns on investment. They've basically been operating investor-led charities.
It is still unsettling seeing Uber turning a profit, but even with that they're not turning a net profit over the lifetime of the company yet and won't be for a few years. Hopefully no-one pops up to compete with them now the sector has profits in it.