Interesting question. I ran some quick numbers on Google, take last years profit for uber ($10B) and naively distribute it between all drivers (est 7M) and it comes out to a raise of 1,428. Most drivers would probably be enticed by that, but it’s not going to radically alter their situation. Also, Ubers board and investors are compelled via profit, as the purpose of a company is generating profit for its shareholders.

Would be great to see something like you suggest take off and gain national appeal, but I suspect that VC money helps with getting billboards/ newspaper ads/ etc. You would need to craft a new sort of coop model that can generate enough profits at the top to be an attractive investment but also share some. AFAIK this works best in small teams doing high value work.