The Uber app keeps pushing notifications to advertise fast food. This is so annoying since you need alerts enabled for when your ride is on its way. As I am a very infrequent customer I just uninstall the app, and reinstall it if I need a ride.
In the case of the Uber app you should be able to turn these off (they are conveniently enabled by default, of course!).
On the iphone it's Setting -> Communication -> Marketing Preferences -> Push notifications.