I still wouldn't provide that data for two reasons. Firstly, all the assurances in the world aren't going to convince me that there's no risk in transmitting my location to a random computer in the cloud. I'm not going to personally comb through an open source project to make sure my data is not being abused. I would have to ' trust' strangers that it is not. And if I'm trusting strangers with my location data well then we're back to square one.

Secondly, and this is really a different issue and perhaps not that widespread, I don't like turning on location on my devices simply because it reduces battery life. It's not a privacy issue but it's another roadblock (pun not intended) to gathering navigation data