There have been numerous times while driving where I need to open the Waze app to navigate somewhere and have had to take the time to close the "Rate Us" screen.

I do not think this should never pop up if the car is moving. Not a whole lot different than preventing typing while driving as it does distract a little more trying to see where to close it or, if someone accidentally touches the area to go rate, then they have to go back to start navigating.