It is a fact that when you install certain apps, the developers of such app(s) bundle addons which are non-critical to the operation of the app itself. Such addons include advertising (Google Ads is legal), Analytics, Developer Tools, Licensing, Social Gaming as well as Push Notification.
The message that you are receiving in your notification bar falls under Push Notification and perhaps Analytics.
1.) You need to narrow down which app is the culprit that bundles this addon. I personally use the app Addons Detector to sniff all my apps.
2.) Okay now you have found it, now what? Delete it. There is no other recourse unless you are capable of disabling the addon
Anyway, a rogue app such as this should be avoided. Just delete it.
3.) Add a 1 star review on Google Play to whack the developer.