It's a bit like a payday loan — the drivers need money _today_ and effectively borrow against the depreciation of their vehicle.
Not sure why you're being downvoted, this is what I've heard as well. It gets a person cash while they are in transitionary periods of time. There are not a lot of jobs you can get paid for almost immediately- most require startup time, training, applications, etc.
https://chicagounbound.uchicago.edu/jle/vol59/iss1/8/
Banning payday loans tends to shift borrowers to worse forms of credit.
One imagines worsening the economics of ride share jobs will do the same.