Used Waze Carpool about 30 times 6 months ago. I was actually pleasantly surprised at the level of support. I reported two software bugs in detail and they did get back to me quickly both times and we had a fairly complex discussion.

I actually read the Waze t&c when I signed up many years ago, the lack of privacy is astounding, they have pretty much all of your location data from driving which did make me feel more secure.