That's Google Play Services for you - lots of features and lots of code.
The Google Play Services library is known to be big and it's getter bigger with each update.
It contains so many classes and methods that some developers hit the DEX method limit:
http://android-developers.blogspot.co.uk/2014/12/google-play-services-and-dex-method.html
Android Studio users can choose which parts of Google Play Services are compiled into their apps:
https://developers.google.com/android/guides/setup
(Scroll down to Selectively compiling APIs into your executable).
Currently i don't think we can do that in b4a.
Perhaps we should make it a feature request?