Startups already distribute wealth a lot. Investors invest in many startups in order to get to that 1%. So even though they make a lot of money on Uber, they've also lost a lot of money on 99 other startups you haven't heard of.
Some investors do only invest in one startup, but no one is making them do that. So if they lose it is their own fault, and if they win it's only fair. They agreed to enter the lottery, that's a lot different than someone being born poor and stuck there. No one agreed to the lottery of birth.