In summary, an app legitimately installed from Play Store can use your bandwidth, CPU power, and battery power to mine bitcoins for the developer, shortening your battery life, extending charging times, and using your data plan costing you money.
What I need from you guys in light of this is recommendations for an app permission denial app that works on Jellybean and kitkat. I want to be able to completely disable internet access for any app I choose. I used to use LBE Privacy Guard but it's ratings have taken a nosedive. Any suggestions?