StreamingAssets folder added to APK

Ok, I’m quite shocked to have discovered that for some reason, Unity adds my StreamingAssets folder into the APK file exported for Android.
I thought they said Unity zips everything intelligently and creates an APK with ONLY the used assets in the scenes added to the APK.
Now for some reason, he adds the streamed assets, even tho they are not explicitly loaded into the scenes not until runtime.
Created a +70mb APK instead of 30mb… quite disappointed.

And finally, my question:
How can I “unzip” the APK to see what else he crams in there so that I can pick out the stuff I don’t want/need?

StreamingAssets is a special folder which is always included with all its contents in the build. It is an exception. The other folders/assets are included based on dependencies.