https://driving-tests.org/confessions-of-an-uber-driver/
> Uber drivers have long been known to give passengers low ratings if they suspect a passenger is going to give them a low rating.
https://www.ridester.com/uber-passengers-ratings-sting/
So, yes, they don't base it off the actual review (that may be a service other than Uber that I'm recalling), but they'll often base your review off the review they expect you to give them.
Seems legit. /s
As with any rating system, there will be outlying bad raters. That's why it is normal for absolutely no one to have a perfect 5 star. It's really not a bid deal.
Yet people are being rated on their tips. People are being rated based on their expected ratings of the driver, regardless of their “success” as a driver.
It’s a big deal because it locks someone out of a system that has forced out its competition (illegally in some cases; such as in London).