Uber has issues but honestly it's night and day compared to what taxis were like. And they decrease DUI's.
Do you believe Rebu could that have managed to draw the same level of venture-capitalist money and unicorn-ness and hype, even sharing the same core technologies, code, and product features?
I don't think it would, and I'm asserting that comes from business-plans, labor relations, legal challenges, government lobbying, investor marketing, etc., which in several cases have been, er, ethically-problematic.
So why would they bother to adopt "Rebu"? It's nothing but downsides: their taxi drivers have to work harder, have to be more polite and drive more safely, have to have cleaner cars, and have to be more accountable in general. Not to mention of course Rebu is going to take a cut of all rides booked on their platform.
There was no way to make regular taxi service better without structural and legal reform that the incumbents did not want. The only way to fix it was to go outside the system and do something sketchy. And it worked! For all their issues and controversies, the ride-hailing app experience is amazing, especially when compared to old-school taxi service. Some legacy taxi services have stepped up and improved a bunch since then, and others have just faded into obscurity.