> Is it normal to be fingerprinted for a job?

Depends on context. In finance or anything concerning children, yes. You’re given autonomy where others are vulnerable. On a construction site, on a factory floor, or in an office, where you’re constantly supervised, no.

> Uber drivers in particular seem a vulnerable group

So are their passengers.

I'm more concerned that Uber gets to farm fingerprints, than drivers are 'forced' to accept it, I suppose. Although I can't identify a clear harm or form of exploitation that would arise from Uber collecting prints, I wouldn't put it past them. Maybe a better middle ground is the licensure part of the government does the fingerprinting. Although not all cities regulate Uber in this way.