> Whether a cash tip or given through an app, 85 percent of drivers agreed that not tipping was a factor in passengers’ ratings.

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