Google's stated reason
for the ban is that the Android app allegedly "interferes with or
accesses another service or product in an unauthorized manner." This
policy is broad, vague, and arbitrary. It isn't clear yet how far Google
is going to go in censoring the Play Store. Are they just going to
target ad blockers? Ad blockers are not only useful and extremely
popular, but also currently the only way that Internet users can effectively protect themselves
against non-consensual third party tracking. Or is Google going to
follow the letter of its policy closely, in which case we would expect
to see other useful privacy-enhancing technologies blocked from the Play
Store, such as the apps that control the permissions of other apps (for instance, preventing the Skype app from tracking your location or the Foursquare app from grabbing the contents of your addressbook) or a hypothetical future port of HTTPS Everywhere? 2

 

Read on

https://www.eff.org/deeplinks/2013/03/google-censoring-android-apps

I read an article about this on TechSpot. The reasoning was the crazy part. Of course, the fact that Google makes tons of money with their ad program has nothing to do with it.

While I am not happy by the move... I can understand why Google would do this (it is their main source of revenue).

 

I use adaway, and although it is not available on the play store, I can still get it though F-droid which is an alternate market for android apps that only accepts open source apps without any questionable permissions.

 

http://f-droid.org/repository/browse/?fdid=org.adaway