It sounds weird in a way possible, but just like Snapchat, Spotify, and other social media sites and music sites, I believe Waze should have an end-of-the-year recap.

What kind of data would this display?
Tickets Avoided: How many cops you were alerted about
Total Distance: How many miles driven with waze
Top Speed: If legal ;)
Avg Speed, Avg Distance, etc.. just some generic data
Then maybe some reporting recaps, like what months you were most active, what did you report the most, etc...

I of course, may not be able to come up with all the cool ones, but I'm sure the right marketing department person can. It would just be a fun little stat to see at the end of the year.