That's fine. They don't have to be better everywhere for me to be happy they exist. People attack Uber without dealing with the very obvious problem that in many, many markets, for both drivers and riders, they're an enormous improvement over the status quo.
And in many markets they were a market-distorting entity that drove already competitive firms to the wall by dumping VC money, meanwhile also circumventing rules which were in place for passenger and public safety.
In what markets did Uber decrease passenger safety relative to existing cab companies? I have literally never been in a locality where the cabs were safer than Uber.
So early on in London there were problems with drivers not having proper insurance to carry passengers, for one, so if anything went wrong there would be no cover (and the driver was technically driving illegally as insurance is required). In some places (again like London) there were also requirements for background checks and registration before someone could be a driver, which uber worked around or just ignored when they entered the market.
Okay. Not having taken London cabs, I cannot disagree with you. What I can tell you is that Ubers in NYC are much safer than cabs in NYC, and Ubers across Africa are much safer than their cab equivalents. To the degree that Uber's technology actually achieves something that cab companies cannot, it's punishing bad driver and rider behavior via the rating system.