I've been treated to the the "you're so beautiful, do you have a boyfriend" act about 2% of the time[0] I get into a stranger's car pretty much across the board, which makes me a little bit skeptical about whether these companies do meaningful oversight. It's possible that these incidents go mostly unreported though. I didn't report mine.

As an aside, this is why I generally trust public transit more whenever it's an option. The worst case scenario is just so much less sinister when there are other people around than it is in a car alone with a stranger.

[0] once in a lyft in seattle, the other in a taxicab in barcelona. figuring I've taken about 100 lifetime solo car rides with strangers which is probably an overestimate.