Waze has actually been discussed in various OSM places for quite a while
now.
Basically, OSM treats Waze the same way it treats Google Map Maker. The map
created by Waze users is Waze's alone and becomes their proprietary
property.
Here's Waze's FAQ on why they didn't use OSM data:
Just wanted to share this with the group. Another tool for mapping.
Waze is a social mobile application providing free turn-by-turn navigation
based on the live conditions of the road.
100% powered by users, the more you drive, the better it gets. Join the
community of drivers in your area
