There can be a fair argument as at what stage would it be necessary to remove the driver, but I think the main thrust of the issue is that to the clients, it is promoted as a taxi service and to the drivers, it is promoted as a dating service.
EDIT: This is literally what happened:
"As Huang Jieli—the woman who had served as Hitch’s general manager until she was demoted last week—said in an interview in 2015: “Like a coffee shop, or a bar, a private car can become a half-open, half-private social space. It’s a very sexy application scenario.” And in another interview (link in Chinese) in 2017, she said “the biggest motivation for our drivers is to share a trip with a passenger.”"
https://qz.com/1374431/after-female-passengers-murder-didis-...